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Female Mary de Brienne Click to view Mary de Brienne in the family tree

Mary was born in 1221.1  Mary's father was Emperor of Byzantium, King Jerusale John de Brienne and her mother was Berengaria of Leon.  Her paternal grandparents were Gautier de Brienne II and Agnes de Garlande de Baudement; her maternal grandparents were King Alphonso of Leon IX and Berengaria of Castile. She had two brothers named Jean and Louis.  She was the oldest of the three children. She had a half-sister named Isabella.

1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jdp-fam&id=I8318

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