Sir William de Ros 
William's father was Robert de Ros and his mother was Isabella. His paternal grandparents were Everard de Ros and Roese Trussebut; his maternal grandmother was Avenal. He was an only child. He died about 1264.General Notes
He opposed King John. He was a Member of Parliament (M.P.) from 1235 to 1236. He lived at Helmsley, Yorkshire, England.
Children of Sir William de Ros and Lucy FitzPiers
* Sir Robert de Ros d. 17 Mar 1285
* Sir William de Ros d. 28 May 1310
* Piers Ros
