Her Majesty Queen Elizabeth II 1947

Elizabeth met her future husband, Prince Philip of Greece and Denmark, in 1934 and 1937. They are second cousins once removed through King Christian IX of Denmark and third cousins through Queen Victoria. After another meeting at the Royal Naval College in Dartmouth in July 1939, Elizabeth—though only 13 years old—said she fell in love with Philip and they began to exchange letters. Their engagement was officially announced on 9 July 1947.

The engagement was not without controversy: Philip had no financial standing, was foreign-born (though a British subject who had served in the Royal Navy during the Second World War), and had sisters who had married German noblemen with Nazi links. Marion Crawford wrote, "Some of the King's advisors did not think him good enough for her. He was a prince without a home or kingdom. Some of the papers played long and loud tunes on the string of Philip's foreign origin." Elizabeth's mother was reported, in later biographies, to have opposed the union initially, even dubbing Philip "The Hun". In later life, however, she told biographer Tim Heald that Philip was "an English gentleman".

Before the marriage, Philip renounced his Greek and Danish titles, converted from Greek Orthodoxy to Anglicanism, and adopted the style Lieutenant Philip Mountbatten, taking the surname of his mother's British family. Just before the wedding, he was created Duke of Edinburgh and granted the style His Royal Highness.

Elizabeth and Philip were married on 20 November 1947 at Westminster Abbey.