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Érard I, Count of Brienne (c. 1060–1114) was Count of Brienne at the end of the 11th century. He was the son of Walter I of Brienne, count of Brienne, and his wife Eustachie of Tonnerre (Eustachie de Tonnerre ).[1] When Érard inherited the county of Brienne, he was invested by Theobald III, Count of Blois.[2]
Érard co-founded an abbey at Boulancourt, and later founded a monastery at Beaulieu.[3] In 1114, Érard followed his liege lord, Hugh, Count of Champagne, to the Holy Land.[4][5]
In 1110 he married Alix of Roucy-Ramerupt,[1] daughter of André de Montdidier-Roucy, seigneur de Ramerupt and son of Hilduin IV, Count of Montdidier. They had: