Roger I of Mortemer (Roger de Mortemer, Roger de Mortimer, Roger Mortimer) (fl. 1054 [1] - aft. 1078), founded the abbey of St. Victor en Caux[2] in the Pays de Caux of Upper Normandy as early as 1074 CE.[3] Roger claimed the castle of Wigmore, Herefordshire that was built by William FitzOsbern, 1st Earl of Hereford. This castle became the chief barony of Roger's descendants.[4] He was the first Norman ancestor to assume the name Mortimer,[2] as in the place-name Mortemer-en-Brai, the land on which the village and castle was located.[1]