It was an advantageous marriage as Walter and her father both held castles and lordships in the Welsh Marches as well as Ireland, and thus the two men looked after each other's interests in both places.
[3] They were dispatched to England where they were both left to starve to death inside the dungeon of Corfe Castle, Dorset on the orders of King John.
Walter de Lacy's estates were forfeited to the Crown as punishment for having harboured traitors inside his castle.
As a further token of John's favour, Walter was appointed Castellan and Sheriff of Hereford the following year,[2] and Margaret obtained permission to found a religious house in memory of her mother.
[4] Margaret's subsequent attempts to free her foundation from the control of the Hospitallers led her into a lengthy dispute which ultimately involved the Pope.