 Wealthy Norman and English lords were frequently captured.After a year, Alan handed command to another Breton, who was later slain, along with many of the king's knights, aggrieving William sufficiently to come to terms with the commander of the castle.It is likely that Alan was with King William I and the other members of the King's Council at Gloucester in Christmas 1085 when they discussed preparations for the extensive survey of England, later known as the Domesday Survey.