Prince Henry, Duke of Gloucester of King George V and Queen Mary. His widow became the longest-lived member of the British royal family in history. Prince Henry was born on 31 March 1900, at York Cottage, on the Sandringham Estate during the reign of his great-grandmother Queen Victoria. His father was the Duke of York (later King George V), the eldest surviving son of the Prince and Princess of Wales (later King Edward VII and Queen Alexandra). His mother was the Duchess of York (later Queen Mary), the only daughter of the Duke and Duchess of Teck. At the time of his birth, he was
Royal descendants of Queen Victoria and King Christian IX cousin, through King Christian IX, of both Tsar Nicholas II of Russia and King Constantine I of Greece. Shortly before the end of the war, Nicholas, his wife and children were executed by the Bolsheviks. Other first cousins of George V, whose countries were neutral during the war, were King Christian X of Denmark, Queen Victoria Eugenie of Spain (queen-consort of King Alfonso XIII) and King Haakon VII of Norway (who was also George's brother-in-law via his marriage to George's sister, Maud). The family tree below also attempts to show the relationship between close and extended family members referenced on