Among the many people I have encountered while reconstructing my family history, few have led me into as many different archives, institutions and historical documents as my great-grandfather, Dr. med. Jürgen Christian Georg Berendsen (1855–1932). He was born in Schleswig, became a physician, established a medical practice in Ratzeburg, married three times and raised a large family. His life extended from the years before German unification to the final months of the Weimar Republic.
For many years, my knowledge of him consisted largely of entries in an old family book and fragments of family recollections. His name, occupation and dates were known, but the person behind those facts remained elusive. A surviving portrait provided a face. A medical dissertation provided a connection to the history of German surgery. Then archival correspondence began to reveal details of his education, professional career, marriages, children and homes.
In 2026, this research developed into a much more substantial investigation. The Stadtarchiv Ratzeburg, Landesarchiv Schleswig-Holstein, Landesarchiv Berlin, university libraries and historians of German student associations provided valuable information. Their findings sometimes confirmed the old family records, sometimes corrected them, and sometimes revealed entirely new questions.
What follows is not a final or exhaustive biography. It is a reconstruction of the life of Jürgen Christian Georg Berendsen, based on the historical material and documentary evidence currently available to me. I have deliberately preserved the distinction between what documents establish and what family tradition remembers.
A Childhood in Schleswig
Jürgen was born on 19 February 1855 in Schleswig, then part of the Duchy of Schleswig. His father was Asmus Berendsen (1821–1901), and his mother was Catharina Margaretha Erichsen (1809–1875). The family belonged to a northern German network of ancestors whose surnames included Berendsen, Erichsen, Petersen, Brix and Nissen.
His childhood took place during a period of political uncertainty. Schleswig occupied a complicated position within the Danish monarchy, and disputes over Schleswig and Holstein culminated in the Second Schleswig War of 1864. By the time Jürgen entered adulthood, Schleswig had become part of Prussia and, subsequently, the German Empire. The country in which he was born was therefore politically quite different from the one in which he eventually practised medicine.
His father, Asmus, is particularly interesting. When Jürgen matriculated at Kiel University in 1877, the university register identified Asmus as the Vorsteher einer privaten Irrenanstalt, the director or superintendent of a private institution for people with mental illnesses. This contemporary entry is important because it independently supports the family's association with institutional care near Schleswig.
My separate investigation of Asmus has led to historical references concerning Klappschau and the development of privately operated psychiatric or nursing institutions in the region. The precise operational history of Asmus's institution, its relationship with Klappschau and its eventual management remain under investigation. Nevertheless, it is striking that Jürgen grew up in a household connected with the care of patients, before choosing medicine as his own profession.
Older family recollections describe Jürgen as a physically weak child. According to one account, he was initially too frail to attend school regularly, and his mother taught him to read using the Bible. It is an evocative detail, suggesting a childhood very different from the university career that followed. However, this story survives as a family recollection, and I have not yet located contemporary documentation confirming his childhood health or home education.
Another account remembers severe punishment by his father after Jürgen took a small amount of money from his mother's table. I mention this cautiously. Such recollections can preserve genuine experiences, but without knowing when and by whom the account was recorded, it would be unfair to turn an isolated episode into a definitive judgement of either father or son.
What is more securely established is that Jürgen eventually attended the Gymnasium in Schleswig. The original Kiel matriculation record identifies this school and includes an abbreviation interpreted by archivist Dr Jörg Rathjen as referring to a Maturitätszeugnis von Schleswig, a school-leaving qualification from Schleswig. Family notes also mention schooling in Flensburg, but this additional stage still requires documentary confirmation.
His mother died on 15 August 1875, when Jürgen was twenty years old. Two years later, he appears in the university records at Kiel, beginning a documented stage of his medical education.
A Medical Student in Kiel and Würzburg
One of the most satisfying developments in this research was the recovery of Jürgen's university documentation. Until recently, I had little more than family information connecting him with medicine at Kiel and Würzburg. The assistance of the Landesarchiv Schleswig-Holstein, which preserves records of the Christian-Albrechts-Universität zu Kiel, changed that.
Dr Jörg Rathjen examined the relevant university registers and confirmed that the entry dated 16 April 1877 belongs to my ancestor. The register identifies his birth date, father, father's occupation and school. These details provide an unusually useful combination of biographical facts in one contemporary document.
A further register records the departure of a student named Georg Berendsen on 3 October 1882. Dr Rathjen considered the identification with my ancestor highly probable, although the surviving record does not explain the circumstances of departure. I therefore retain the date as a well-supported identification rather than treating every associated detail as proven beyond doubt.
His studies were not confined to Kiel. Jürgen also spent time at Würzburg, where his involvement with student associations has become an unexpectedly productive research subject. His university years belonged to a period when German students often maintained strong affiliations with academic societies, many of which kept extensive membership registers and later historical compilations.
The documentary record now establishes associations with Troglodytia Kiel, Makaria Würzburg and Corps Makaria-Guestphalia. The precise sequence of memberships, including transitions between different organisational forms, must be interpreted within the histories of those associations.
In November 2026, Wolfgang Schmidt, a member of Landsmannschaft Alemannia Makaria Würzburg, contacted me after seeing a research enquiry published through the Gemeinschaft für deutsche Studentengeschichte. He supplied information and photographs from several historical membership directories. According to his findings, Georg Berendsen entered Makaria in 1878, and had previously belonged to Troglodytia Kiel.
The Landsmannschaft membership list identifies him as Georg Berendsen, Dr med., physician, resident in Ratzeburg, under membership number 16. Another directory, for Corps Makaria-Guestphalia, lists him as member 87, describes him as a doctor and Sanitätsrat, and records his death in Berlin in 1932. His name also appears in the Kösener Corps lists and in Herbert Kater's historical account of Makaria, where an entry is identified as number 147.
An important correction arose during this correspondence. The initially reported departure year of 1997 was a typographical error, subsequently corrected by Mr Schmidt to 1897. This kind of small correction demonstrates why it is essential to examine original editions rather than perpetuate mistakes from transcriptions or correspondence.
The student-association evidence adds something that ordinary civil registers cannot. It places Jürgen within a social and academic network extending beyond his formal medical studies. It also shows that his professional identity and residence remained connected to his student associations long after his university years.
Some of these organisations lost substantial historical material during the destruction of Würzburg in the Second World War. Consequently, gaps in their records are not necessarily evidence that activities or memberships did not exist. The surviving directories may represent only fragments of what was once a much larger documentary record.
The 1883 Dissertation and the Surgeons Esmarch and Neuber
Perhaps the most compelling academic document I have discovered is Jürgen's medical dissertation, published under the name Georg Berendsen. Its title is Die Esmarch'sche Methode der Hasenschartenoperation, issued by Lipsius & Tischer in Kiel in 1883. The illustrated work comprises thirteen pages and concerns the surgical treatment of cleft lip using a method associated with Friedrich von Esmarch.
The use of Georg rather than his full given names deserves explanation. Historical records frequently use selected given names, and the combination of university records, professional chronology and later biographical references allows the dissertation to be associated with Jürgen Christian Georg Berendsen. The abbreviated author name should not be mistaken for a different individual simply because it does not reproduce his entire baptismal name.
His doctorate was awarded on 17 July 1883. Dr Rathjen located the date in the 1884 chronicle of Kiel University, providing an independent contemporary reference to the degree.
The dissertation is especially valuable because it goes beyond a description of surgical technique. Its closing material includes autobiographical information concerning Georg's education, university studies, military service and examinations. These passages offer the potential for a precise chronology written by Georg himself, although individual dates still need to be extracted and cross-checked before being reproduced in a definitive timeline.
Another important passage is his acknowledgement of two doctors who were influential in the surgical world of Kiel. Georg thanks Geheimrat Friedrich von Esmarch for permission to publish the surgical method and expresses gratitude to Dr Gustav Neuber for repeated assistance. Unlike later family recollections, these acknowledgements are contemporary statements made by Georg himself.
Friedrich von Esmarch (1823–1908) was a leading surgeon at Kiel, associated with advances in military surgery, surgical blood control, wound treatment and organised first aid. Gustav Adolf Neuber (1850–1932) was another important surgical figure, particularly associated with the development of aseptic techniques.
Georg's decision to write about a method connected with Esmarch places his academic work within a period of rapid change in surgery. Developments in anaesthesia, antisepsis, asepsis and operative technique were transforming what surgeons could attempt and what patients could survive. The treatment of congenital cleft lip was a demanding surgical problem, particularly when infection control, tissue handling and postoperative recovery were considerably less developed than they are today.
The family notes describe Georg as an assistant to Esmarch. That claim has been one of my principal research objectives, but the evidence presently supports a narrower conclusion. The dissertation demonstrates a professional and academic connection; it does not, by itself, prove that Georg held a formal, salaried assistantship at Esmarch's clinic.
Both the Landesarchiv Schleswig-Holstein and the historical collections of Kiel University Library have searched relevant surviving material. They have not identified personnel or clinical records establishing such an appointment. The University Library also checked its physical dissertation copies, catalogued as TZ 7 and TG 3828, and found no additional annotations or information compared with the publicly available digital edition.
The Schleswig-Holsteinische Landesbibliothek examined its Esmarch holdings and found no correspondence explicitly identified as being to or from Georg Berendsen. It did, however, identify two letters written by Gustav Neuber to Esmarch in 1879–1880, under references F3/15/22 and F3/15/26. Their contents have not yet been examined for possible mentions of Georg.
For the time being, I can confidently describe Georg's documented academic contact with Esmarch and Neuber, while continuing to investigate whether a more formal working relationship existed. In historical research, the absence of surviving documentation is a limitation, not automatically a disproof.
Establishing a Medical Practice in Ratzeburg
After completing his medical education, Georg established himself as a practising physician. By 1885, civil records place him and his family in Ratzeburg, a town in the Duchy of Lauenburg region of northern Germany. This is earlier than some residence dates suggested by later compiled genealogical material, and it provides an important chronological anchor for his professional life.
His occupation appears in family and civil documentation as a practical physician, praktischer Arzt, and later with the designation Sanitätsrat. The latter is independently supported by a student-association directory, making it more than an isolated family claim. The specific appointment document and date of award, however, have not yet been recovered.
Ratzeburg became the central geographical setting of his adult life. Here he practised medicine, lived with successive family households, experienced bereavements and raised children. The town's surviving civil registers have become exceptionally important because they connect his biography with original records of births, marriages and deaths.
One particularly interesting part of his story concerns the family property in Brauerstraße. Historical documents associate Georg with the building later numbered Brauerstraße 8/10. An older house number, 112, appears in the family research, and a historical house-book extract has provided a more extensive numbering history.
Hans Mau's Die Straßen und Häuser der Inselstadt Ratzeburg von 1700 bis 1950, compiled in 1963, connects the property with earlier numbering arrangements and names Georg Berendsen in association with the year 1893. It also names Hornbostel as a previous owner and Marianne Berendsen, née Sachsenröder, in the subsequent ownership history.
The material suggests a progression from earlier Brauerstraße numbers 117/116 around 1800, to number 112 in the nineteenth century, and finally to numbers 8/10 in the twentieth century. This is useful for identifying the same property across different documentary systems. However, Mau does not provide detailed references for every underlying claim, so the exact ownership dates cannot yet be treated as if they came directly from a verified land register.
In October 2026, Stadtarchiv Ratzeburg supplied me with the relevant page from Mau's work. The archive also identified files 5927 and 5929 concerning street designations and house numbers. It could not locate a surviving municipal building file for the property. A separate search by the Kreisarchiv Herzogtum Lauenburg did not identify the historical ownership documentation in its holdings.
The property history has become a research project of its own. I would still like to establish when Georg acquired the building, how it was arranged for his household and medical practice, and what happened to it after his death. The original land-register records, if they survive, would be particularly useful.
One family recollection describes a passage between neighbouring buildings wide enough for a horse. Details of that kind provide a sense of the physical environment, but I will not attempt to reconstruct the original layout without architectural plans, photographs or other appropriate evidence.
His First Family: Nicoline Jebsen
Georg's first wife was Nicoline Auguste Anne Petrine Jebsen, who died in Ratzeburg on 16 April 1901. Her name appears with minor variations in historical documents, and some older family material records a different given-name form. The combination of the Ratzeburg civil registers and the later marriage record of their son Georg Maria Friedrich provides stronger evidence for her identity.
In October 2026, Marijke Nippert of the Landesarchiv Berlin supplied a baptism record for Nicoline. This places her birth in November 1854 and identifies her parents as Heinrich and Maria Jebsen. Because an older genealogical report carries an inconsistent birth date, I am retaining the distinction between the original baptismal information and previous compiled entries.
At least three children are associated with Georg and Nicoline in the current reconstruction. Their eldest identified son, Leonhard Asmus Heinrich Berendsen, was born in 1885. A second son, Georg Maria Friedrich Berendsen, was born in Ratzeburg on 6 May 1887. Their daughter, Anna Maria Julie Berendsen, was born in January 1892 but died shortly afterwards.
Anna's story was one of the most personally meaningful discoveries in my recent research. I knew that an additional child had existed, but had previously been unable to establish the details. When Christian Lopau at Stadtarchiv Ratzeburg identified the relevant death entry, the information finally provided a name and an explanation for a gap that had remained in my family tree for a long time.
The records also illustrate the limits of using a marriage date estimated from a later genealogy. The family's eldest identified child's birth in 1885 must be reconciled with older accounts placing the marriage around 1886. I have therefore not assigned a precise first-marriage date in this biography.
Nicoline died on 16 April 1901. The Ratzeburg death entry is numbered 27/1901. Her death ended the first major chapter of Georg's family life. He would subsequently marry again and have further children, but the identities of Nicoline and her children deserve to remain clearly distinguished from the later family branches.
The Brömel Family and a Second Marriage
On 6 May 1903, Georg married Cläre Dorothea Maria Theodora Brömel in Ratzeburg. The marriage is documented in the civil register, number 13/1903, and the surviving marriage banns provide additional family information.
Cläre was born on 5 July 1876 and belonged to the family of the Protestant theologian and church official Dr Albert Robert Brömel. Her mother was Friederike Bertha Amalie Rosamunde, née Ochs, who had previously been married to a man named Kindt. These connections link Georg's biography with another substantial branch of my genealogical research.
The marriage records have proved particularly useful because they connect the Berendsen, Brömel and Ochs families through contemporary documentation. They also supply details that later family compilations sometimes simplify, omit or spell differently.
Three children were born to Georg and Cläre: Friedrich Jürgen Karl Brömel Berendsen on 15 March 1904, Clara Johanna Marianne on 15 May 1906, and Anneliese on 10 July 1908.
Friedrich, often known as Fritz, was my grandfather. His original Ratzeburg birth register entry, number 26/1904, is one of the documents I was especially pleased to obtain. Although I already possessed the family's old family book, seeing the contemporary civil record gave me a more authoritative foundation for his birth and parentage.
The family was again struck by loss when Cläre died on 2 December 1908, only a few months after Anneliese's birth. Her death is recorded in Ratzeburg register number 82/1908. Georg was now a widower for the second time, with very young children.
The surviving documentation establishes the births and deaths, but it tells us much less about how the household functioned after Cläre's death. I do not know precisely who cared for the younger children during the following years. That is one of the questions for which family letters, household records or contemporary recollections would be particularly valuable.
Spiekeroog and Marianne Sachsenröder
Georg's third marriage introduces one of the more personal and unusual sources in the collection: an eighteen-page family biography or memoir concerning Marianne Antoinette Sachsenröder (1882–1956), preserved through the Stadtarchiv Ratzeburg.
Marianne was born in Kassel on 15 June 1882, into the Sachsenröder family. The family material describes her upbringing among several sisters and her later work connected with teaching or the care of children. Her history provides a different perspective on Georg's life because it was preserved through recollections about his eventual wife rather than through his own academic or civil records.
The surviving family account associates their acquaintance with the North Sea island of Spiekeroog. Notes refer to a young teacher looking after two French girls, and the broader biographical tradition places Georg and Marianne's meeting around 1910. The earlier reference to the summer of 1909 should not be treated as proof of their precise first meeting without reconciliation with the fuller memoir.
Unlike these more personal recollections, the marriage date is established through archival research. Christian Lopau identified their marriage as having taken place on 26 October 1910 in Hamm, Westphalia, under register number 302/1910. The original marriage entry itself remains a valuable document to obtain or examine in full.
Georg and Marianne's children formed a further branch of the family. The current reconstruction names Karl, Otto, Hans-Jürgen, Marianne and Ernst-Günter. The Ratzeburg registration records provide particularly useful details for several of them.
Karl Berendsen was born on 13 August 1911 on Spiekeroog, strengthening the evidence that the island was an important location for the family. Otto's birth details remain insufficiently established, although the Ratzeburg archivist considered Spiekeroog a possible birthplace.
Hans-Jürgen Berendsen was born on 26 June 1919 in Ratzeburg and died during the Second World War on 3 February 1944, according to the registration information supplied by the archive. Marianne Berendsen was born on 28 February 1922, and Ernst-Günter Berendsen on 30 October 1925, both in Ratzeburg. Ernst-Günter died on 28 February 1945, during the closing months of the war.
These events extend beyond Georg's own lifetime, but they help explain the broader history of the household he established. His children belonged to different generations, some reaching adulthood before the First World War and others growing up during the Weimar Republic and subsequently experiencing the Second World War.
The memoir concerning Marianne remains an especially important source for understanding the family's personal life. Unlike an official register, which normally records only selected events, such a biography may preserve details about personality, relationships, travel, domestic responsibilities and the circumstances surrounding a marriage. At the same time, its retrospective character requires caution: remembered episodes should be distinguished from dates independently established by contemporary records.
His Later Years and Death in Berlin
Georg remained associated with Ratzeburg during the later part of his life. The date of his retirement from medical practice, the exact circumstances of his later working years and the extent of any residence outside Ratzeburg remain incompletely documented.
His death, however, is supported by an original civil-register entry obtained from the Landesarchiv Berlin in October 2026. The register, Berlin Standesamt XII B, number 625/1932, confirms that Dr Jürgen Christian Georg Berendsen died on 19 April 1932.
The research identifies the place of death as Moabit Hospital in Berlin, with the recorded time of death at 3:45 in the afternoon. His residence was given as Ratzeburg, and his wife was identified as Marianne, née Sachsenröder.
This record resolved an important uncertainty. Earlier family accounts gave Berlin as the place of death, but I wanted an original register entry rather than relying entirely on inherited information. The Berlin archive also confirmed that it could not identify a supplementary file or marriage annotation associated with this death entry.
The family research records cancer of the epiglottis as the cause of death. Until the precise wording and its documentary origin are confirmed, this should be understood as the currently recorded medical explanation rather than a diagnosis independently established here from hospital records.
Georg died at the age of seventy-seven, in the final year of the Weimar Republic before the National Socialist seizure of power. His lifetime had encompassed the Danish–German conflict over Schleswig, the foundation and collapse of the German Empire, a world war and the emergence of a German republic.
He had also witnessed extraordinary changes in medicine. When he was a child, many surgical procedures carried severe risks from pain, infection and blood loss. By the time he died, surgery had been transformed by developments in anaesthesia, antisepsis, asepsis and clinical practice. His academic work at Kiel places him within that period of transition, even though the full details of his own professional achievements remain to be reconstructed.
What the Archives Have Given Back
One of the most interesting aspects of this research has been the cumulative effect of relatively small discoveries. No single document provides Georg's complete biography. Instead, different institutions preserve different fragments, and the fragments gradually become more meaningful when compared.
The university register identifies the young man and his family background. The dissertation establishes his medical interests and academic connections. Student-association directories identify another dimension of his university and professional life. Ratzeburg's civil registers document his family, while the historical house book provides clues about his home and medical practice. Berlin's death register confirms the final event in his chronology.
The process has also demonstrated why original records matter. A family book may preserve an accurate birth date, but the contemporary civil entry confirms it in a different way. A family recollection may describe a relationship with a famous surgeon, but the dissertation tells us precisely what Georg himself acknowledged. An old house-book entry may name an owner, but the land register is needed to establish the legal transfer.
Several people have contributed generously to these investigations. Christian Lopau at Stadtarchiv Ratzeburg located an impressive collection of family records and provided important explanations of historical entries. Dr Jörg Rathjen at Landesarchiv Schleswig-Holstein helped establish Georg's university chronology. Marijke Nippert at Landesarchiv Berlin located the death register and additional family documentation.
At Kiel University Library, Friederike Hülsmann examined surviving dissertation copies and searched relevant historical holdings. Dr Maike Manske at the Schleswig-Holsteinische Landesbibliothek identified the surviving Neuber–Esmarch correspondence that may provide future research leads. Carsten Müller and other contributors to the Institut für deutsche Studentengeschichte helped circulate my enquiry, and Wolfgang Schmidt subsequently recovered important student-association references.
These efforts remind me that family history is not simply a matter of searching databases. It depends on archivists, librarians, historians and individuals willing to share their time and expertise. Many of the most useful findings emerged only because a person recognised the significance of an obscure reference or knew where an overlooked record might survive.
A Biography Still Being Written
There is much more that I would like to know about my great-grandfather. His dissertation gives us an unusual glimpse of the young physician, but his later medical career remains much less fully documented. I would particularly like to establish his professional appointments, the history of his Ratzeburg practice, and whether surviving clinical or personal correspondence can tell us more about his work.
I also hope to clarify his childhood in Schleswig and the relationship between his father's institution and his own decision to study medicine. The student-association discoveries may lead to additional photographs, correspondence or references in university publications. Meanwhile, the memoir concerning Marianne Sachsenröder offers an opportunity to examine his domestic life from a perspective entirely different from the formal records.
His personal history was complicated. Three marriages, repeated bereavements and eleven recorded children meant that his family was not a single, simple household extending unchanged through time. The different branches need to be reconstructed independently and then brought together with care.
I began this investigation with a name, a photograph and fragments of an old family history. I now have contemporary university evidence, a dissertation, civil-register documents, student-association references, archival correspondence and a growing collection of family material. Each addition makes it possible to distinguish more clearly between what is known, what is probable and what remains only a promising lead.
That is the purpose of this biography. I am not trying to create a flawless or romanticised picture of an ancestor. I am trying to understand the real person who lived between 1855 and 1932: a son of Schleswig, a medical student in Kiel and Würzburg, a physician in Ratzeburg, a husband and father, and a man whose life left traces in records scattered across Germany.
The investigation continues, and I intend to update this article as further original documents become available.
Sources and Archival References
The following sources and research materials underpin this biography. Original documents, contemporary publications, retrospective family material and modern archival correspondence are distinguished by their descriptions. Some documents remain privately held or are not yet available through public links.
- Landesarchiv Schleswig-Holstein, University of Kiel records. Matriculation and departure registers, including the 16 April 1877 matriculation; relevant entries discussed by Dr Jörg Rathjen in October 2026. Collection Abt. 47.
- Christian-Albrechts-Universität zu Kiel. Chronik der Universität Kiel (1884), confirming the doctorate on 17 July 1883. University chronicle.
- Georg Berendsen. Die Esmarch'sche Methode der Hasenschartenoperation. Kiel: Lipsius & Tischer, 1883. Thirteen pages, illustrated. Bibliographical record and digital edition.
- Universitätsbibliothek Kiel, Historical Collections. Dissertation copies TZ 7 and TG 3828; comparison and archival correspondence with Friederike Hülsmann, October 2026.
- Schleswig-Holsteinische Landesbibliothek. Friedrich von Esmarch collection and correspondence relating to Gustav Neuber, references F3/15/22 and F3/15/26; correspondence with Dr Maike Manske, November 2026. These letters are research leads, not yet evidence that Berendsen is mentioned in them.
- Hans Diem and Gerhard Hoffmeister. Die Landsmannschaften Makaria, Saxonia und Saxo-Makaria. Edited on behalf of the Altherrenschaft by Ulrich Becker. Würzburg, 1988. Membership entry for Georg Berendsen, number 16, page 90.
- Makaria-Guestphalia membership directory. Georg Berendsen, member number 87; historical extract supplied through Wolfgang Schmidt, November 2026.
- Kösener Corpslisten. 1930 edition, relevant entry on page 1382, supplied through Wolfgang Schmidt.
- Herbert Kater. Makaria zu Würzburg. Internal association history, Würzburg, November 1989, entry 147; reproduction supplied by Wolfgang Schmidt.
- Institut für deutsche Studentengeschichte. Neues aus dem Institut, number 22, third quarter 2026, research enquiry concerning Dr Georg Berendsen on page 9.
- Stadtarchiv Ratzeburg. Marriage register number 13/1903, Georg Berendsen and Clara Dorothea Maria Theodora Brömel, dated 6 May 1903, with surviving marriage-banns documentation.
- Stadtarchiv Ratzeburg. Birth register number 78/1885, Leonhard Asmus Heinrich Berendsen.
- Stadtarchiv Ratzeburg. Birth register number 25/1887, Georg Maria Friedrich Berendsen.
- Stadtarchiv Ratzeburg. Death register number 1/1892, Anna Maria Julie Berendsen.
- Stadtarchiv Ratzeburg. Death register number 27/1901, Nicoline Auguste Anne Petrine Berendsen, née Jebsen.
- Stadtarchiv Ratzeburg. Birth register number 26/1904, Friedrich Jürgen Karl Brömel Berendsen.
- Stadtarchiv Ratzeburg. Birth register number 43/1906, Clara Johanna Marianne Berendsen.
- Stadtarchiv Ratzeburg. Birth register number 53/1908, Anneliese Berendsen.
- Stadtarchiv Ratzeburg. Death register number 82/1908, Clara Dorothea Maria Theodora Berendsen, née Brömel.
- Stadtarchiv Ratzeburg. Death registers concerning Dr Albert Robert Brömel, number 65/1885, and Friederike Bertha Amalie Rosamunde Brömel, née Ochs, number 50/1903.
- Standesamt Hamm, Westphalia. Marriage register number 302/1910, Georg Berendsen and Marianne Antoinette Sachsenröder, dated 26 October 1910; reference identified by Stadtarchiv Ratzeburg.
- Stadtarchiv Ratzeburg. Historical registration cards and information concerning Karl, Otto, Hans-Jürgen, Marianne and Ernst-Günter Berendsen, communicated by Christian Lopau in October 2026.
- Stadtarchiv Ratzeburg, Sammlungsbestand 237. Erinnerungen an meine Mutter, eighteen-page privately produced family biography concerning Marianne Antoinette Sachsenröder. Retrospective family evidence.
- Hans Mau. Die Straßen und Häuser der Inselstadt Ratzeburg von 1700 bis 1950. 1963, extract concerning Brauerstraße 8/10. Secondary historical compilation; the ownership details still require verification from land records.
- Stadtarchiv Ratzeburg. Files 5927 and 5929, concerning street designations and house numbering, identified in correspondence dated 26 October 2026.
- Kreisarchiv Herzogtum Lauenburg. Correspondence of 30 October 2026 concerning the unsuccessful search for additional historical ownership records for Brauerstraße 8/10.
- Landesarchiv Berlin. Standesamt Berlin XII B, death register number 625/1932, Dr Jürgen Christian Georg Berendsen, 19 April 1932.
- Landesarchiv Berlin. Marriage register, Königsberg, number 55/1912, Georg Maria Friedrich Berendsen and Freda Theodor, 17 February 1912.
- Landesarchiv Berlin. Baptismal record of Nicoline Auguste Anne Petrine Jebsen, dated 14 November 1854, supplied through archival correspondence in October 2026.
- Stadtarchiv Ratzeburg. Death register number 158/1956 and death notification of Marianne Antoinette Sachsenröder, dated 20 July 1956.
- Family documents. Historical family book, physical portrait attributed to Georg Berendsen at approximately twenty-three years of age, and surviving family photographs and recollections. Retrospective details require individual assessment.
- MacFamilyTree 11. Person Report for Dr med. Jürgen Christian Georg Berendsen, October 2026, and related family charts. These are research compilations, not substitutes for their underlying original records.
- Kieler Stadtarchiv. Historical account of Friedrich von Esmarch and the development of first-aid training at Kiel. Historical reference.
- Professional and archival correspondence, September–November 2026. Christian Lopau, Dr Jörg Rathjen, Marijke Nippert, Friederike Hülsmann, Dr Maike Manske, Carsten Müller and Wolfgang Schmidt. Used to identify, interpret and assess the records listed above.
I remain personally responsible for the research, interpretation, conclusions and publication decisions. The biography is an evolving reconstruction; not every family recollection or secondary-source statement has yet been independently confirmed against an original record.
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