Sibella De Mitford 
Sibella's father was John De Mitford. She was an only child. Sibella is no longer alive.General Notes
Still Living.
They had a son named William I.
Family Notes
CHAN17 May 2004
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Children
William I Bertram
William I was born about 1080 in Mitford, Nortumberland, England. He died in 1150.
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