Prior to marrying Elizabeth, Philip was Prince Philip of Greece and Denmark. In order to marry, he abandoned his Greek and Danish royal titles, converted from Green Orthodoxy to Anglicanism and became a naturalized British subject.
Elizabeth II and Philip are second cousins once removed and third cousins. They initially met in 1934 at the wedding of Philip's cousin Princess Marina of Greece and Denmark, when Philip was 13 and Elizabeth was 8.
Elizabeth fell in love with Philip at a meeting at the Royal Naval College in Dartmouth in 1939, when she was 13. They started a correspondence and became secretly engaged in 1946. It was officially announce on July 9, 1947, after Elizabeth had turned 21.
Elizabeth had to use ration coupons to buy the material for her wedding gown.
Prior to the wedding Philip took the names of Duke of Edignburgh, Earl of Merioneth, and Baron Greenwich of the County of London. After the wedding, until her coronation, Elizabeth took the name Princess Elizabeth, Duchess of Edinburgh.
Due to being so close after WWII, the Duke of Edinburgh's German relatives were not invited to the wedding, including his three sisters. Former King Edward VIII, the Duke of Windsor, was also not invited.