Geoffroy III de Semur was born circa 1050 to Geoffroy II de Semur (c1018-c1075) and Adelaide of Nevers (c1032-c1077) and died 1123 of unspecified causes. He married Ermanjart de Montagu (c1052-aft1088) 1072 JL . Charlemagne (747-814), Hugh Capet (c940-996), Rollo of Normandy (860-932).
|Geoffroy IV de Semur (?-bef1128)|
|Renaud de Semur (?-1129)|