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Male Jean De Brienne Click to view Jean De Brienne in the family tree

Jean De was born about 1217 in Acre, Palestine.1   Jean De's father was Jean Count De Brienne and his mother was Berengaria Alfonsez Princess Leon.  His maternal grandfather was Alfonso IX Fernandez Leon. He had two brothers named Alphonse De and Louis.  He was the second oldest of the three children.  He died in 1296.1 

1 phelps1609.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609