British Royalty, pic: March 1947, Tilbury, London, Prince William of Gloucester, right, with his brother Prince Richard of Gloucester having returned by ship from Australia, Prince William, 1941-1972, (grandson of King George V) was killed in a plane cras [Getty Images]

British Royalty, pic: March 1947, Tilbury, London, Prince William of Gloucester, right, with his brother Prince Richard of Gloucester having returned by ship from Australia, Prince William, 1941-1972, (grandson of King George V) was killed in a plane crash in 1972 (Photo by Popperfoto via Getty Images/Getty Images) — see more

British Royalty, pic: March 1947, Tilbury, London, Prince William of Gloucester, right, with his brother Prince Richard of Gloucester having returned by ship from Australia, Prince William, 1941-1972, (grandson of King George V) was killed in a plane crash in 1972 (Photo by Popperfoto via Getty Images/Getty Images)