Sibella de Mitford 
Sibella de was born about 1048 in Mitford Castle, Morpeth, Northumberland, England. Sibella de's father was John de Mitford , Saxon Thane. She was an only child. Sibella de is no longer alive.
They had a son named William I.
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Children
William I Bertram , of Mitford, Sir
William I was born about 1080 in Mitford Castle, Morpeth, Northumberland, England. He died in 1150.
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