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
Feudal barony of Dunster Milton Abbey, Dorset, and the couple made many extravagant alterations to the Castle, including the addition of the carved wooden staircase and a new dining-room with elaborate plasterwork ceilings. An inventory dated 1690 survives, which lists the sumptuous fittings and furnishings at that date. By his wife Mary Tregonwell he had two daughters, Mary and Frances, and a son and heir Tregonwell Luttrell (1683–1703), of Dunster Castle, who died without children. Tregonwell Luttrell (1683–1703), son, who died without children. Col. Alexander Luttrell (1663–1711), uncle, youngest son of Francis Luttrell (1628–1666) of Dunster Castle. He matriculated at Christ Church, Oxford in