Ranulph de Mortimer

Ranulph I de Mortimer (Ralf, Ralph, Raoul de Mortemer) (born before c.1070–died in/after 1104) was a Marcher Lord from the Montgomery lands in the Welsh Marches (border lands between Wales and England). In England, he was Lord of Wigmore in Herefordshire. In Normandy, he was the Seigneur of St. Victor-en-Caux. Ranulph was the founder of the English House of Mortimer of Wigmore. He acquired Wigmore Castle after William Fitz Osbern's son Roger de Breteuil joined the Revolt of the Earls of 1075. His lands and holdings in Herefordshire and Shropshire were granted to him by William the Conqueror before 1086.

After William the Conqueror's death, the Kingdom of England and the Duchy of Normandy were divided. Ranulph of Mortemer joined the ranks of the Rebellion of 1088 against the new King of England, William Rufus. Together with Norman, English and Welsh Marcher Lords, they invaded and conquered the lands of Hereford, Gloucester and Worcestershire. A year later, the revolt failed and the marches of Normandy, from Maine to the Evrecin, were in disorder. King Rufus took advantage of this opportunity to align with the barons of Upper Normandy by bribing them. Of these barons, Ranulph maintained his land by accepting a bribe from the King in which he had to give his support to England. He did this by garrisoning his castle and sacking surrounding enemy territories as an attack against the new Duke of Normandy, Robert Curthose. The Norman baron allegiance set the stage for a race between the heirs of William I, where the Duke of Normandy and the King of England sought to gain as much support from powerful and influential houses as possible against each other.

...
Wikipedia