Prince William, Duke of Cambridge, (William Arthur Philip Louis; born 21 June 1982) is a member of the British royal family. He is the elder son of Charles, Prince of Wales, and Diana, Princess of Wales, and since birth has been second in the line of succession to the British throne, after his father.

William was educated at four schools in the United Kingdom and obtained a degree from the University of St. Andrews. He spent parts of a gap year in Chile, Belize, and some parts of Africa. In December 2006, he completed 44 weeks of training as an officer cadet and was commissioned in the Blues and Royals regiment. In April 2008, he qualified as a pilot by completing pilot training at Royal Air Force College Cranwell. He then underwent helicopter flight training in order to become a full-time pilot with the RAF Search and Rescue Force in early 2009. His service with the British Armed Forces ended in September 2013.

William married Catherine Middleton on 29 April 2011 at Westminster Abbey. Hours before the wedding, he was created Duke of Cambridge, Earl of Strathearn, and Baron Carrickfergus. The couple have three children: Prince George, Princess Charlotte, and Prince Louis.