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Male Baron of Mitford Roger de Bertram I Click to view Baron of Mitford Roger de Bertram I in the family tree

Roger was born in 1128 in Mitford, Northumberland, England.1   Roger's father was William Bertram I and his mother was Hawise  de Baliol.  His paternal grandparents were Sir Richard Bertram and Sibilla de Mitford; his maternal grandparents were Guy de Baliol and Dionsyia de Northumberland. He had a half-brother named Richard.  He died at the age of 71 in 1199.1 

Family Details of Roger's family with Ada de Morville

1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=arciek&id=I28335&style=TABLE
Further sources/citations:
http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jdp-fam&id=I66260, http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=arciek&id=I19463

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