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

Mary was born about 1221.1   Mary's father was Jean De Brienne and her mother was Berenguela Princess of Leon And Castile.  Her paternal grandparents were Count I of Brienne Erard and Agnes De Montfaucon; her maternal grandparents were King Of Leon Alfonso and Berenguela Queen Of Castile**. She had four brothers and a sister, named Guy I, Louis, Jean II, Alphonse and Yolanthe.  She was the third oldest of the six children.

1 Genealogical Research of Kirk Larson

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