William de Mohun, 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".
Empress Matilda conferred upon him the title Earl of Somerset, in 1141. In the foundation charter of the priory at Bruton , he describes himself as "Willielmus de Moyne, comes Somersetensis".  Unlike Baldwin de Redvers who was created Earl of Devon by Matilda at around the same time, William's title was not recognised by Stephen or Henry II, Matilda's son, and his descendants did not use the title.
William de Mohun, Earl of Somerset, married Agnes de Gaunt, daughter of Walter de Gaunt and Maud of Brittany, daughter of Stephen, Count of Tréguier, 3rd Lord of Richmond (born btw. 1058/62 – died 21 April 1136), (he is sometimes misidentified as "Stephen, Count of Brittany").
- Hunt 1894.
- Lyte, pp.5-6.
- Lyte, p.8.
- Lyte, pp.7-8.
- Weis, Frederick Lewis. Ancestral Roots of Certain American Colonists Who Came to America before 1700. Eighth ed. (2004): p. 137 [Line 143:24] (author states, "AGNES DE GAUNT, m. William de Mohun, adult by 1131, d. in or bef. 1155, Earl of Somerset, held barony of Dunster, Somerset, son of Sir William de Mohun, d. aft. 1190, lord of Dunster, Sheriff of Somerset, 1084, 1086, by his wife Adeliz.").
- Hunt, William (1894). Lee, Sidney (ed.). Dictionary of National Biography. 38. London: Smith, Elder & Co. . In
- Ancestral Roots of Certain American Colonists Who Came to America Before 1700 by Frederick Lewis Weis; Line 143-24
- G. E. C., ed. Geoffrey F. White. The Complete Peerage. (London: St. Chaterine Press, 1953) Vol. XII, Part 1, p. 36-38.
- Lyte, Henry Churchill Maxwell. A history of Dunster and of the families of Mohun & Luttrell, London: The St. Catherine Press Ltd, 1909.
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