Anglo-Saxon Chronicle. 1079. This year Robert (age 28), the son of King William (age 51), deserted from his father to his uncle Robert in Flanders (age 46); because his father (age 51) would not let him govern his earldom in Normandy; which he himself, and also King Philip (age 26) with his permission, had given him. The best men that were in the land also had sworn oaths of allegiance to him, and taken him for their lord. This year, therefore, Robert (age 28) fought with his father (age 51), without Normandy, by a castle called Gerberoy; and wounded him in the hand; and his horse, that he sat upon, was killed under him; and he that brought him another was killed there right with a dart. That was Tookie Wiggodson. Many were there slain, and also taken. His son William (age 23) too was there wounded; but Robert (age 37) returned to Flanders. We will not here, however, record any more injury that he did his father (age 51).