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Male William III 1st Baron de Ros , of Helmsley, MP Click to view William III 1st Baron de Ros , of Helmsley, MP in the family tree

William III 1st Baron de was born about 1255 in Helmsley Castle, North Ride Yorkshire, England.  William III 1st Baron de's father was Robert IV "1st Baron" de Ros , of Belvoir, MP and his mother was Isabel de Albini , Heiress of Belvoir.  His paternal grandparents were William I de Ros , MP, Lord of Helmsley, Sir and Lucy FitzPiers; his maternal grandparents were William II de Albini , Lord of Belvoir and Isabel. He had three sisters named Mary de, Joan de and Isabel de.  He was the second oldest of the four children.  He died in Wark Castle, Wark-on-Tweed, Northumberland, England.


William III 1st Baron de's family with Maud de Vaux

‌William III 1st Baron de and Maud de were married in a religious ceremony before 1287.  They had a son and a daughter, named William IV 2nd Baron de and Agnes de.

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