Mold Castle was erected under instructions from the Earl also known by what name?
Mold Castle Mold Castle (Welsh: "Castell yr Wyddgrug" ), on Bailey Hill in the town of Mold, Flintshire, Northeast Wales, is a motte-and-bailey castle erected around 1072, probably by the Norman Robert de Montalt under instructions from Hugh d'Avranches, Earl of Chester. Little remains except the mound on which the motte was built. It stands close to the 15th-century parish church, St Mary's Church near the centre of the town.
Osbern the Steward Osbern the Steward, known in French as "Osbern de Crépon" († about 1040), was the Steward of two Dukes of Normandy and the father of William FitzOsbern, 1st Earl of Hereford, one of William the Conqueror's closest counsellors.