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 were closely related due to their mutual descent from either Queen Victoria, King Christian IX or both. The most commonly cited example is the fact that Nicholas, his wife, Alexandra, and Kaiser Wilhelm II of Germany were all first cousins of King George V of the United Kingdom. Other countries who fought against Germany in addition to Russia and the United Kingdom were Romania, whose queen-consort, Marie, wife of King Ferdinand I, was a cousin of the Kaiser, and Greece, whose queen-consort, Sophia, wife of King Constantine I, was the Kaiser's own sister. Additionally, King George V was a first