Prince Philip, Duke of Edinburgh (born Prince Philip of Greece and Denmark, 10 June 1921),[fn 1] is the husband of Queen Elizabeth II of the United Kingdom and other Commonwealth realms.

Philip was born into the Greek and Danish royal families. He was born in Greece, but his family was exiled from the country when he was an infant. After being educated in France, Germany and the United Kingdom, he joined the British Royal Navy in 1939, aged 18. From July 1939, he began corresponding with the 13-year-old Princess Elizabeth, whom he had first met in 1934. During the Second World War he served with distinction in the Mediterranean and Pacific Fleets.

After the war, Philip was granted permission by George VI to marry Elizabeth. Before the official announcement of their engagement in July 1947, he abandoned his Greek and Danish royal titles and became a naturalised British subject, adopting the surname Mountbatten from his maternal grandparents. He married Elizabeth on 20 November 1947. Just before the wedding, he was created Duke of Edinburgh, Earl of Merioneth and Baron Greenwich. Philip left active military service when Elizabeth became queen in 1952, having reached the rank of commander, and was formally made a British prince in 1957.

Philip and Elizabeth have four children: Prince Charles, Princess Anne, Prince Andrew and Prince Edward. Through a British Order in Council issued in 1960, descendants of the couple not bearing royal styles and titles can use the surname Mountbatten-Windsor, which has also been used by some members of the royal family who do hold titles, such as Princess Anne and Princes Andrew and Edward.

A keen sports enthusiast, Philip helped develop the equestrian event of carriage driving. He is a patron, president or member of over 780 organisations and serves as chairman of The Duke of Edinburgh's Award for people aged 14 to 24. He is the longest-serving consort of a reigning British monarch and the oldest ever male member of the British royal family. Philip retired from his royal duties on 2 August 2017, at the age of 96, having completed 22,219 solo engagements since 1952.