Prince Philip, Duke of Edinburgh, Earl of Merioneth and Baron Greenwich, was born Prince of Greece and Denmark in Corfu on 10 June 1921; the only son of Prince Andrew of Greece. His paternal family is of Danish descent - Prince Andrew was the grandson of King Christian IX of Denmark. His mother was Princess Alice of Battenberg, the eldest child of Prince Louis of Battenberg and sister of Earl Mountbatten of Burma. Prince Louis became a naturalised British subject in 1868, joined the Royal Navy and rose to become an Admiral of the Fleet and First Sea Lord in 1914. During the First World War he changed the family name to Mountbatten and was created Marquess of Milford Haven. Prince Philip adopted the family name of Mountbatten when he became a naturalised British subject and renounced his Royal title in 1947. Prince Louis married one of Queen Victoria's granddaughters. Thus, The Queen and Prince Philip both have Queen Victoria as a great-great-grandmother. They are also related through his father's side. His paternal grandfather, King George I of Greece, was Queen Alexandra's brother.
The engagement of Lieutenant Philip Mountbatten to Princess Elizabeth was announced in July 1947 and the marriage took place in Westminster Abbey on 20 November. Shortly before the wedding, the bridegroom was created Duke of Edinburgh, Earl of Merioneth and Baron Greenwich with the style of His Royal Highness and appointed a Knight of the Garter by the King. The Queen and Prince Philip had two children before and two after The Queen succeeded to the throne.
Since The Queen's accession, The Duke of Edinburgh, who is Patron or President of some 800 organisations, has played a prominent part in many aspects of national life. His special interests are in scientific and technological research and development, the encouragement of sport, the welfare of young people, and conservation and the environment.