William the Conqueror's intellect is said to have remained clear right up to his death. He would have questioned whether any of his three sons individually had the ability to rule the troublesome amalgam of England, Normandy and Maine once he was gone. The Bastard's Sons is the story of those three men: Robert, William and Henry of Normandy. Of Robert, the dying king is said to have claimed he was 'a proud and silly prodigal', adding that 'the country...