Wigmore Castle

Wigmore Castle was founded after the Norman Conquest, probably c. 1070, by William FitzOsbern, 1st Earl of Hereford and a close associate of William the Conqueror. It was built on waste ground at a place called Merestun, the settlement by the mere or lake. The land was held at the time of the Conquest by Gunnfrothr or Gunnvarthr, who also held land at Lingen and Brampton Bryan. The associated village of Wigmore below the castle was probably also founded by FitzOsbern, perhaps around the earlier settlement.

The form of FitzOsbern's early castle at Wigmore is unknown, but given the scale of his fortifications at Chepstow, Monmouth and elsewhere, it is likely to have been substantial and probably covered much the same area as the present castle. In particular, he probably had a natural ravine reshaped to create a deep ditch behind the motte. No evidence of early stone defences has yet been discovered, leading to the conclusion that FitzOsbern's castle was built of timber, but it is just possible that the dense vegetation and thick deposits of debris conceal the foundations of an early stone keep.

FitzOsbern was killed in Flanders in 1071, and his son Roger de Breteuil took part in the Revolt of the Earls in 1075; after the Earls' subsequent defeat, William I seized the castle and gave it to another of his supporters, Ranulph de Mortimer (or Ralph de Mortimer). From this time on Wigmore became the head of the barony of the Mortimers, later from 1328 Earls of March.