"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 his father was then deceased. The Chronicle of Alberic de Trois-Fontaines names "comitem Brenensem Galterum et sororem eius Felicitatem" as children of "Erardus…comes Brenensis" & his wife. The Genealogiæ Scriptoris Fusniacensis names "Galterum comitem eiusdem loci et sororem eius nomine Felicitatem" as children of "Aerardo comiti Briennensi" & his wife, specifying that "Galterus comes genuit Aerardum comitem et Andream atque Mariam castellanam de Sancto Otmaro cum aliis liberis".
He succeeded his father as Comte de Brienne. Seigneur de Ramerupt. He founded the abbey of Bassefontaine with his mother in 1143. "Walterus Brenensis comes" granted "decimam reddituum suorum de Brena Castello" to the abbey of Basse-Fontaine by charter dated 22 Jan 1143, subscribed by "Airardi filii sui, Andree filii sui, Marie filie sue…Johannis de Brena clerici…Guidonis fratris comitis".
He took part in the Second Crusade in 1147. 2
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