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Male William I de Ros , MP, Lord of Helmsley, Sir Click to view William I de Ros , MP, Lord of Helmsley, Sir 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 Isabel of Scotland.  His paternal grandparents were Everard de Ros , Lord of Helmsley, Sir and Roese de Trussebut; his maternal grandparents were William The Lion King of Scotland and Isabel Avenal. 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 Alice de.

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