William de Mohun of Dunster, 1st Earl of Somerset William de Mohun of Dunster, 1st Earl of Somerset William de Mohun of Dunster, Earl of Somerset (c. 1090 – c. 1155), 2nd feudal baron of Dunster, was a favourite of Empress Matilda and a loyal supporter of her in the war against King Stephen, during which he earned the epithet of the "Scourge of the West". William was the son of William de Moion, who was seigneur of Moyon which is close to Saint-Lô. The elder William was High Sheriff of Somerset in 1084. During the war between Matilda and Stephen, Stephen marched against Mohun's castle at Dunster, but
Dunster listed building and scheduled monument. Dunster Priory was established as a Benedictine monastery around 1100. The first church in Dunster was built by William de Mohun who gave the church and the tithes of several manors and two fisheries, to the Benedictine Abbey at Bath. The priory, which was situated just north of the church, became a cell of the abbey. The church was shared for worship by the monks and the parishioners, however this led to several conflicts between them. One outcome was the carved rood screen which divided the church in two with the parish using the west