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 second son of Christian IX, Prince William, became King of Greece as George I shortly after his sister Alexandra's marriage due to this new connection with the British Royal Family. On 27 October 1889 his son, later Constantine I of Greece, married Sophia of Prussia, a granddaughter of Victoria, forging another union between descendants of the British queen and the Danish king. In 1865, Christian IX's second daughter, Princess Dagmar, became engaged to Tsarevich Nicholas of Russia, son and heir of Tsar Alexander II. Following the untimely death of her fiancé, Dagmar married Nicholas's younger brother, the Tsarevich Alexander in