André de Brienne

http://fmg.ac/Projects/MedLands/chambrien.htm#ErardBriennedied1190B

Guillaume de Brienne & his wife EUSTACHIE de Courtenay had two children:

a) ANDRE de Brienne (-before May 1215, bur Auxerre Saint-Etienne). “Eustachia comitissa Sacricesaris” recorded that “filius meus...bone memorie Andreas de Brena” had requested her and “fratri meo Willelmo de Tanlay” to carry out his last wishes, and founded an anniversary for him at Auxerre Saint-Etienne where he was buried, by charter dated May 1215[104].

b) ELVIS de Brienne . The primary source which confirms her parentage and marriage has not yet been identified. m JEAN Vicomte de Saint-Florentin, son of - (-before Jul 1235).