Prince Sigismund of Prussia (1896–1978)
Prince William Victor Charles Augustus Henry Sigismund of Prussia( 27 November 1896 at Kiel – 14 November 1978 at Esparza, Costa Rica), was the second son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine.
He was a nephew of Kaiser Wilhelm II and Tsarina Alexandra of Russia.
A great- grandson of Queen Victoria through both his parents, he was the only one of three brothers who did not have the hemophilia common among her descendants.
Victoria, Princess Royal
Victoria, Princess Royal
(Victoria Adelaide Mary Louisa; 21 November 1840 – 5 August 1901) was German Empress and Queen of Prussia by marriage to German Emperor Frederick III.
She was the eldest child of Queen Victoria of the United Kingdom and Prince Albert of Saxe-Coburg and Gotha, and was created Princess Royal in 1841.
She was the mother of Wilhelm II, German Emperor.
Educated by her father in a politically liberal environment, Victoria was betrothed at the age of sixteen to Prince Frederick of Prussia and supported him in his views that Prussia and the later German Empire should become a constitutional monarchy on the British model.
Criticised for this attitude and for her English origins, Victoria suffered ostracism by the Hohenzollerns and the Berlin court.
This isolation increased after the rise to power of Otto von Bismarck (one of her most staunch political opponents) in 1862.
Victoria was empress for only a few months, during which she had opportunity to influence the policy of the German Empire.
Frederick III died in 1888 – just 99 days after his accession – from laryngeal cancer and was succeeded by their son William II, who had much more conservative views than his parents.
After her husband's death, she became widely known as Empress Frederick (German: "Kaiserin Friedrich").
The empress dowager then settled in Kronberg im Taunus, where she built Friedrichshof, a castle, named in honour of her late husband.
Increasingly isolated after the weddings of her younger daughters, Victoria died of breast cancer on 5 August 1901, not long after her mother's death on 22 January 1901.
The correspondence between Victoria and her parents has been preserved almost completely: 3,777 letters from Queen Victoria to her eldest daughter, and about 4,000 letters from the empress to her mother are preserved and catalogued.
These give a detailed insight into the life of the Prussian court between 1858 and 1900.
Prince Sigismund of Prussia (1864–1866)
Prince Francis Frederick Sigismund of Prussia (15 September 1864 – 18 June 1866) was the fourth child and third son of Crown Prince Frederick William of Prussia (later King of Prussia and German Emperor as Frederick III), and Victoria, Princess Royal, eldest daughter of the British Queen Victoria.
He was born at the New Palace in Potsdam, Germany, in 1864 and known as "Sigi" to his family.
His mother found him much more intelligent than his three elder siblings and believed he would have great potential when he grew up.
However, he died from meningitis at the New Palace on 18 June 1866, aged twenty-one months.
He was buried in the royal mausoleum of the Friedenskirche at Potsdam.
His mother's grief and despair were intense as his father, leading the Prussian army into battle against Austria, had taken all available doctors thus making it impossible for her to alleviate the suffering of her child or prevent his death, the memory of which would haunt her for the rest of her life.
Prince Sigismund was the first grandchild of Queen Victoria to die, almost 115 years before his last cousin Princess Alice, Countess of Athlone, who died in 1981.
Princess Charlotte of Prussia (1831–1855)
Princess 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.
She was the eldest child and daughter of Prince Albert of Prussia( younger son of Frederick William III of Prussia and Louise of Mecklenburg- Strelitz) and his first wife Princess Marianne of the Netherlands( daughter of William I of the Netherlands and Wilhelmine of Prussia).
Christian of Oliva
Christian of Oliva, also Christian of Prussia( died 4 December 1245) was the first missionary bishop of Prussia.
Princess Barbara of Prussia
Princess Barbara of Prussia (2 August 192031 May 1994) was the only daughter and elder child of Prince Sigismund of Prussia and Princess Charlotte of Saxe-Altenburg.
She was a great-granddaughter of Frederick III, German Emperor and a great-great-granddaughter of Queen Victoria.
On 17 September 1952 she was legally adopted by her paternal grandmother, Princess Irene of Prussia ("née" Princess Irene of Hesse and by Rhine), a granddaughter of Queen Victoria.
Princess Elisabeth of Prussia
Princess Elisabeth of Prussia( 18 June 1815 – 21 March 1885) was the second daughter of Prince Wilhelm of Prussia and Landgravine Marie Anna of Hesse- Homburg and a granddaughter of Frederick William II of Prussia.
Prince Philip, Duke of Edinburgh is her great- great- grandson.
Sophie, Princess of Prussia
Sophie Johanna Maria, Princess of Prussia( née" Princess of Isenburg", born 7 March 1978) is the wife of Georg Friedrich, Prince of Prussia, head of the House of Hohenzollern, members of which reigned as kings of Prussia and as German emperors until deposed in 1918.
Prince Friedrich Sigismund of Prussia (1891–1927)
Prince Joachim Viktor Wilhelm Leopold Friedrich Sigismund of Prussia( 17 December 1891 – 6 July 1927) was a German World
War I fighter pilot and member of the House of Hohenzollern.
He was the son of Prince Friedrich Leopold of Prussia and Princess Louise Sophie of Schleswig- Holstein- Sonderburg- Augustenburg, married in 1916.
Prince Christian-Sigismund of Prussia
Prince Christian- Sigismund of Prussia( born March 14, 1946) is one of the three paternal uncles of Georg Friedrich, Prince of Prussia, head of the House of Hohenzollern since 1994, which reigned over Germany until 1918.
He is the youngest of four sons born to Louis Ferdinand, Prince of Prussia( 1907- 1994) and Grand Duchess Kira Kirillovna of Russia( 1909- 1967).
He was the heir presumptive to the headship of the deposed House of Hohenzollern from the death of his father to 20 January 2013, when Georg Friedrich fathered twin sons, relegating Christian- Sigismund to a more remote place in the Line of succession to the former German throne.

Question: Why did Prince Sigismund Of Prussia (1864–1866)'s mother die?
Answer: breast cancer