Prince William , Duke of Cambridge KG KT ADC ( P ) ( William Arthur Philip Louis ; born 21 June 1982 ) , is the elder son of Charles , Prince of Wales , and Diana , Princess of Wales .
Prince William , Duke of Cambridge KG KT ( William Arthur Philip Louis ; born 21 June 1982 ) is the oldest son of Charles , Prince of Wales and the late Diana , Princess of Wales , and grandson of Queen Elizabeth II and Prince Philip , Duke of Edinburgh .