William I Bertram , of Mitford, Sir 
William I was born about 1080 in Mitford Castle, Morpeth, Northumberland, England. He died in 1150.General Notes
William Bertram, son of Richard Bertram by Sybella Mitford, his wife, founded, with the approbation of his wife and sons, the Augustinian Priory of Brinkburne, in Northumberland, m. Hawyse, dau. of Sir William Merley, of Morpeth, and left issue, Roger, Guy, William and Richard. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 52, Bertram, Barons Bertram, of Mitford]
‌William I and Hawise de were married in a religious ceremony before 1134 in 2nd wife?. They had a son named Richard I.
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Children
Richard I Bertram , of Bothal
Richard I was born about 1135 in Mitford, Northumberland, England. He died before 1177 in Bothal Demesne, Morpeth, Northumberland, England.
They had a son named Roger I.
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Children
Roger I Bertram , of Mitford, Sir Knight
Roger I was born about 1130 in Mitford Castle, Morpeth, Northumberland, England. He died before 1177.
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