Regnier I, Count of Hainaut
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Regnier I, Count of Hainaut, lay Abbot of Echternach (Luxembourg) 897-915, was born 850 Hainault, France. His name is variously also Reginar, Rainier and others.
He was the son of Gislebert, Count of Darnau and Ermengarde of Lorraine. He died 915/916. He married Hersent, daughter of Charles II. They had a child, Regnier II, Count of Hainault.