Louis I, Grand Duke of Hesse
Louis I, Grand Duke of Hesse( 14 June 1753 in Prenzlau – 6 April 1830 in Darmstadt) was" Landgrave of Hesse- Darmstadt"( as" Louis X") and later the first" Grand Duke of Hesse and by Rhine".
Princess Louise of Hesse-Darmstadt (1761–1829)
Louise Henriette Karoline of Hesse- Darmstadt( 15 February 1761 – 24 October 1829), was the first Grand Duchess of Hesse and by Rhine by marriage.
Louis III, Grand Duke of Hesse
Louis III, Grand Duke of Hesse and by Rhine( 9 June 1806, Darmstadt – 13 June 1877, Seeheim) was Grand Duke of Hesse and by Rhine from 1848 until his death in 1877.
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.
Margaret, Princess of Hesse and by Rhine
Margaret, Princess of Hesse and by Rhine( born Margaret Campbell Geddes, 18 March 1913 – 26 January 1997) was the wife of Louis, Prince of Hesse and by Rhine, the last prince of the House of Hesse- Darmstadt.
Born in Ireland, she became a noted art patron in her adopted homeland of Germany.
Prince Charles of Hesse and by Rhine
Prince Charles of Hesse and by Rhine (23 April 1809 - 20 March 1877) was the second surviving son of Louis II, Grand Duke of Hesse and Wilhelmine of Baden.
Louis II, Grand Duke of Hesse
Louis II( 26 December 1777 – 16 June 1848) was Grand Duke of Hesse and by Rhine from 6 April 1830 until 5 March 1848, resigning during the German Revolution of 1848.
He was the son of Louis I, Grand Duke of Hesse, and Princess Louise of Hesse- Darmstadt.
Princess Irene of Hesse and by Rhine
Princess Irene of Hesse and by Rhine(" Irene Luise Marie Anne, Princess of Hesse and by Rhine", 11 July 1866 – 11 November 1953) was the third child and third daughter of Princess Alice of the United Kingdom and Louis IV, Grand Duke of Hesse and by Rhine.
Her maternal grandparents were Queen Victoria and Prince Albert of Saxe- Coburg and Gotha.
Her paternal grandparents were Prince Charles of Hesse and by Rhine and Princess Elizabeth of Prussia.
She was the wife of Prince Henry of Prussia, a younger brother of Wilhelm II, German Emperor and her first cousin.
The SS" Prinzessin Irene", a liner of the North German Lloyd was named after her.
Her siblings included Princess Victoria of Hesse and by Rhine, wife of Prince Louis of Battenberg, Grand Duchess Elizabeth Feodorovna of Russia, wife of Grand Duke Sergei Alexandrovich of Russia, Ernest Louis, Grand Duke of Hesse and by Rhine, and Empress Alexandra Feodorovna of Russia, wife of Tsar Nicholas II of Russia.
Like her younger sister, the empress, Irene was a carrier of the hemophilia gene, and Irene would lose her sisters Alix and Elisabeth in Russia to the Bolsheviks.
Prince Louis of Battenberg
Admiral of the Fleet Louis Alexander Mountbatten, 1st Marquess of Milford Haven, (24 May 1854 – 11 September 1921), formerly Prince Louis Alexander of Battenberg, was a British naval officer and German nobleman related to the British royal family.
Although born in Austria, and brought up in Italy and Germany, he enrolled in the United Kingdom's Royal Navy at the age of fourteen.
Queen Victoria and her son King Edward VII, while he was Prince of Wales, occasionally intervened in his career: the Queen thought that there was "a belief that the Admiralty are afraid of promoting Officers who are Princes on account of the radical attacks of low papers and scurrilous ones".
However, Louis welcomed assignments that provided opportunities for him to acquire the skills of war and to demonstrate to his superiors that he was serious about his naval career.
Posts on royal yachts and tours arranged by the Queen and Edward actually impeded his progress, as his promotions were perceived as undeserved royal favours.
After a naval career lasting more than forty years, in 1912 he was appointed First Sea Lord, the professional head of the British naval service.
With the First World War looming, he took steps to ready the British fleet for combat, but his background as a German prince forced his retirement once the war began, when anti-German sentiment was running high.
He changed his name and relinquished his German titles, at the behest of King George V, in 1917.
He married a granddaughter of Queen Victoria, and was the father of Queen Louise of Sweden and Louis Mountbatten, 1st Earl Mountbatten of Burma, who also served as First Sea Lord from 1954 to 1959.
He is the maternal grandfather of Prince Philip, Duke of Edinburgh, husband of Queen Elizabeth II.
Princess Victoria of Hesse and by Rhine
Princess Victoria of Hesse and by Rhine, later Victoria Mountbatten, Marchioness of Milford Haven
(Victoria Alberta Elisabeth Mathilde Marie; 5 April 1863 – 24 September 1950) was the eldest daughter of Louis IV, Grand Duke of Hesse and by Rhine (1837–1892), and his first wife Princess Alice of the United Kingdom (1843–1878), daughter of Queen Victoria and Prince Albert of Saxe-Coburg and Gotha.
Her mother died while her brother and sisters were still young, which placed her in an early position of responsibility over her siblings.
Over her father's disapproval, she married his first cousin Prince Louis of Battenberg, an officer in the United Kingdom's Royal Navy, and lived most of her married life in various parts of Europe at her husband's naval posts and visiting her many royal relations.
She was perceived by her family as liberal in outlook, straightforward, practical and bright.
During World War I, she and her husband abandoned their German titles and adopted the British-sounding surname of Mountbatten, which was simply a translation into English of the German "Battenberg".
Two of her sisters—Elisabeth and Alix, who had married into the Russian imperial family—were killed by communist revolutionaries.
She was the maternal grandmother of Prince Philip, Duke of Edinburgh, the consort of Queen Elizabeth II.

Question: What is the date of death of Princess Victoria Of Hesse And By Rhine's husband?
Answer: 11 September 1921