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Male William I De Ros Mp, Lord Of Helmsley, Sir/Roos Click to view William I De Ros Mp, Lord Of Helmsley, Sir/Roos in the family tree

William I De was born about 1196 in Helmsley Castle, North Ride Yorkshire, England.  William I De's father was Robert De Ros Lord Of Helmsley, Sir Knight and his mother was Isabella Scotland [Princess]. He had a brother named Robert De.  He was the older of the two children.  He died in 1264 in Poitou, France.

William I De's family with Lucy Fitzpiers

They had two sons and a daughter, named Robert IV "1St Baron" De, William II De and Lucy De.

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