Question: Which disease did one of the subjects of Charlotte Zeepvat's writing have?

full_context: Document 1: Alfred, Duke of Saxe-Coburg and Gotha: Alfred (Alfred Ernest Albert; 6 August 184430 July 1900) reigned as Duke of Saxe-Coburg and Gotha from 1893 to 1900. He was the second son and fourth child of Queen Victoria of the United Kingdom and Prince Albert of Saxe-Coburg and Gotha. He was known as the Duke of Edinburgh from 1866 until he succeeded his paternal uncle Ernest II as the reigning Duke of Saxe-Coburg and Gotha in the German Empire.
Document 2: Marie Elizabeth de LaFite: Marie Elizabeth de LaFite (Born August 21, 1737) was a published author, translated English texts into French, and was a Dutch governess before joining the service of Queen Charlotte of England while her native country went through the French Revolution.
Document 3: Lady Colin Campbell: Georgia Arianna, Lady Colin Campbell ("née" Ziadie; born 17 August 1949) is a Jamaican-born British writer, socialite, and television and radio personality. She has published three books about the British Royal Family. They include biographies of Diana, Princess of Wales, which was on "The New York Times" bestseller list in 1992, and Queen Elizabeth The Queen Mother. She has also written two autobiographies, one exploring her mother.
Document 4: Princess Alice, Countess of Athlone: Princess Alice, Countess of Athlone, (Alice Mary Victoria Augusta Pauline; née Princess Alice of Albany; 25 February 1883 – 3 January 1981) was a member of the British Royal Family. She is the longest-lived Princess of the Blood Royal of the British Royal Family, and was the last surviving grandchild of Queen Victoria. She also held the titles of Princess of Saxe-Coburg and Gotha and Duchess in Saxony from birth, as well as a Princess of Teck by marriage, until 1917 when the British Royal Family ceased usage of German titles. She was godmother to Queen Beatrix of the Netherlands, who is the granddaughter of her first cousin on her mother's side, Queen Wilhelmina of the Netherlands.
Document 5: Prince Friedrich of Hesse and by Rhine: Prince Friedrich of Hesse and by Rhine (Friedrich Wilhelm August Victor Leopold Ludwig; 7 October 1870 – 29 May 1873) was the haemophiliac second son of Louis IV, Grand Duke of Hesse, and Princess Alice of the United Kingdom, one of the daughters of Queen Victoria. He was also a maternal great-uncle of Prince Philip, Duke of Edinburgh through his eldest sister Princess Victoria of Hesse and by Rhine.
Document 6: Prince Leopold, Duke of Albany: Prince Leopold, Duke of Albany, (Leopold George Duncan Albert; 7 April 185328 March 1884) was the eighth child and youngest son of Queen Victoria and Prince Albert of Saxe-Coburg and Gotha. Leopold was later created Duke of Albany, Earl of Clarence, and Baron Arklow. He had haemophilia, which led to his death at the age of 30.
Document 7: Prince George, Duke of Kent: Prince George, Duke of Kent, {'1': ", '2': ", '3': ", '4': "} (George Edward Alexander Edmund; 20 December 1902 – 25 August 1942) was the fourth son of George V of the United Kingdom and Queen Mary.
Document 8: Princess Charlotte of Cambridge: Princess Charlotte of Cambridge (Charlotte Elizabeth Diana; born 2 May 2015) is the younger child and only daughter of Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge. She is fourth in line of succession to the British throne, after her paternal grandfather, her father, and her elder brother.
Document 9: Hedvig Elisabeth Charlotte of Holstein-Gottorp: Hedwig Elisabeth Charlotte of Holstein-Gottorp (Swedish: "Hedvig Elisabeth Charlotta" ; 22 March 1759 – 20 June 1818) was Queen of Sweden and Norway as the wife of King Charles XIII and II. She was also a famed diarist, memoirist and wit. She is generally known in Sweden by her full pen name in Swedish (above), though her official name as queen was Charlotte.
Document 10: Cat Royal: Cat Royal (also known as Cat Royal Adventures) is a series of 7 historical fiction adventure books by Julia Golding, a British novelist. The main character of the series is an orphan named Catherine "Cat" Royal. The series are set in 18th Century London where Cat lives in the Theatre Royal, Drury Lane, after she was abandoned on the front steps of the theatre and taken in by Richard Brinsley Sheridan, the owner of the theatre. The main themes are slavery and equality between people from all races and social classes. While the main cast of characters are fictional, some real historical figures, such as Olaudah Equiano, feature as supporting characters.
Document 11: Charlotte Zeepvat: Charlotte M. Zeepvat is an author and historian of European royal history. She has written five books published by Sutton Publishing, including biographies of Prince Leopold, Duke of Albany and the Romanov Imperial Family. An avid collector of original historical photographs, Zeepvat has also produced two collections of royal photographs, one about Queen Victoria and the other about the Romanovs.
Document 12: Prince Leopold of Bavaria (born 1943): Prince Leopold (Poldi) of Bavaria (German: "Leopold Rupprecht Ludwig Ferdinand Adalbert Friedrich Maria et omnes sancti Prinz von Bayern" ) (born 21 June 1943) is a member of the Bavarian royal house of Wittelsbach and a former champion race car driver. He descends from King Ludwig I of Bavaria in direct line and is a distant relative to the current head of the House of Wittelsbach, Franz, Duke of Bavaria and his brother, Maximilian, Duke in Bavaria. He also descends from Austrian Emperor Franz Joseph and his wife Elisabeth and from King George II of Great Britain, and is therefore a distant cousin of Elizabeth II. As a Roman Catholic he is excluded from the line for the British throne by the Act of Settlement 1701. He also descends from Isabella II of Spain, through her daughter, and Leopold´s great-grandmother, María de la Paz.
Document 13: Princess Charlotte of Prussia (1831–1855): Princess Frederica Louise Wilhelmina Marianne "Charlotte" of Prussia (21 June 1831 – 30 March 1855), was by birth a Princess of Prussia and member of the House of Hohenzollern and by marriage Hereditary Princess of Saxe-Meiningen.
Document 14: Ernest II, Duke of Saxe-Coburg and Gotha: Ernest II (German: "Ernst August Karl Johann Leopold Alexander Eduard"; 21 June 1818 – 22 August 1893) was the sovereign duke of the Duchy of Saxe-Coburg and Gotha, reigning from 1844 to his death. Ernest was born in Coburg as the eldest child of Ernest I, Duke of Saxe-Coburg-Saalfeld, and his duchess, Princess Louise of Saxe-Gotha-Altenburg. Fourteen months later, his younger brother Prince Albert was born, who became consort of Queen Victoria of the United Kingdom. Ernest's father became Duke of Saxe-Coburg and Gotha in 1826 through an exchange of territories.
Document 15: Robert Jobson: Robert Jobson is a newspaper correspondent, broadcaster and author. He is co-author of "" written with Princess Diana’s police protection officer Inspector Ken Wharfe MVO. He is also the co-author of "Bulletproof", the life story of Royal Marine and George Cross recipient Matt Croucher GC. He has written several non-fiction books on royalty, including "The Future Royal Family" (2015). He has reported on the British Royal Family since 1991 as royal correspondent for UK national newspapers including the "Daily Express", "The Sun" and "London Evening Standard". He was the recipient of the London Press Club "Scoop of the Year" award for his world exclusive that Prince Charles and Camilla Parker-Bowles were to wed in 2005. Jobson is Royal Editor for Australia's 7 network top-rated breakfast show Sunrise. He is also royal commentator for US network ABC News. He is Royal Consultant for Mark Schwahn's originally scripted series "The Royals" for E! starring British actresses Elizabeth Hurley and Dame Joan Collins and played cameo roles as himself in series 1, 2 and 3.
ground_truth: haemophilia