Ranulph de Mortimer

He acquired Wigmore Castle after William Fitz Osbern's son Roger de Breteuil joined the Revolt of the Earls of 1075.

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.

[4] At the Welsh Marches in 1093, Ranulph joined Norman forces,[5] leading with Earl Roger of Shrewsbury, Ralph Tosny of Clifford Castle and Philip de Braose of Radnor.

[6] They founded the castles of Dinieithon, near present Llandrindod Wells, and Cymaron in Maelienydd, located between Llanbister and Llangunllo.

However, after the Battle of Mortemer of 1054, Roger lost the land and was banned from Normandy for his failure to capture an enemy of the Duke William.

They were related to William de Warenne, 1st Earl of Surrey, and descendants of a sister of Gunnor, the wife of Richard I of Normandy.