Baron William Bertram 
William was born about 1099 in Castle Mitford, Nhum, England.. William's father was Sir Richard of Mitford Bertram and his mother was Sybilla (Sigel) Mitford. His paternal grandparents were William Bertram and Daughter deBostenburgh; his maternal grandfather was Lord John Mitford. He was an only child.General Notes
pg 52, Burke's " A Genealogical History of the Dormant, Abeyant, Forfeited and Extinct Peerages of the British Empire" published 1883
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Children
Baron Roger Bertram
Roger was born in 1126 in Castle Mitford, Nhum, England.. He died at the age of 48 in 1174. He was buried in Brinkburn.
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