Born in 1020, Walter was the son of Engelbert IV of Brienne[1] and Pétronille.
On 22 May 1048, he attended the council of Senlis, presided over by Guy of Châtillon, bishop of Reims, and King Henry I of France.
[2] Around 1082, Walter was in dispute with the Abbaye of Montier-en-Der.
[3] Theobald III, Count of Blois, was obliged to intervene and requested Hughes of Die, legate of the pope, to excommunicate Walter.
[4] Walter married Eustachie de Tonnerre,[1] daughter of Milo III, count of Tonnerre and 'Azeka.