Sir William de St. Maur II of Undy and Penhow

Sir William was born in of Penhow, Monmouthshire.  Sir William's father was Sir William de St. Maur and his mother was Eva Marshal. He had a brother named Sir Roger. He had a half-brother and six half-sisters, named Peter, Eva, Isabela, Maud, Eleanor, Ela and Joan.  He died in 1271.