A note of a donation by "Hugo comes Trecorum" to "Monasterium Arremari" is included in a charter dated 1113, signed by "Milo comes Barri, Ayrardus frater eius comes Brenie".
He succeeded his father as Comte de Brienne. "Airardus comes Brinensis" confirmed donations of "pater meus Walterius comes" to the abbey of Molesme with the consent of "mater mea et due sorores mee" by charter dated to [1085/95].
He took part in the First Crusade in 1097.
"Airardus comes Brinensis filius Walterii comitis" donated property to the abbey of Molesme with the consent of "matre sua Eustachia comitissa et uxore sua [blank], necnon et Milone fratre suo comite de Barro" by charter dated to [1085/1111]. "Airardus Breonensis comes…et comitem Barrensem Milonem fratrem suum" are named in a charter dated [1125 or before], in which "Walterii nepotis sui filii Airardi defuncti comitis" is named, clarifying that Comte Erard was then deceased. 2
Orthographic variation: Evrard