 At least five of the Lieutenants, Sir Edward Warner, Sir Gervase Helwys, Isaac Penington, Colonel Robert Tichborne, and Sir Edward Hales, themselves later became prisoners in the Tower.The earliest known Lieutenant was Giles de Oudenard at the beginning of the reign of Edward I, while Anthony Bek, later Bishop of Durham, was Constable.The next recorded Lieutenant was Ralph Bavant, who served during John de Crumwell's tenure as Constable.