Prince William of Gloucester (William Henry Andrew Frederick; 18 December 1941 – 28 August 1972) was a grandson of King George V and paternal cousin of Queen Elizabeth II. At the time of his birth he was fourth in line to the throne , and ninth in line at the time of his death.
Prince William, Duke of Cambridge, KG, KT, PC, ADC (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. Since birth, he has been second in the line of succession to the British throne after his father.