Sir William de Ros 
Sir William was born about 1196.1 Sir William's father was Baron Robert "The Surety" de Ros and his mother was Isabel of Scotland. His paternal grandparents were Everard de Ros and Roysia Trusbut. He was an only child. He died in 1258.2 General Notes
[Brøderbund WFT Vol. 12, Ed. 1, Tree #3953, Date of Import: Apr 25, 1999]
INFO FROM "ANCESTORS OF AMERICAN PRESIDENTS, PAGE 181 LIBRARY OF
CONGRESS #95-75183
Details of Sir William's family with Lucia Fitz-Piers
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