Feudal barony of Dunster of Dunster, was as follows: William de Moyon (died post 1090) ("alias" de Moion, later de Mohun), Domesday Book holder of Dunster Castle, 1st feudal baron of Dunster, was Seigneur of Moyon near Saint-Lô in Normandy and was Sheriff of Somerset in 1086. He was the founder of the English "de Mohun" family, prominent in the Westcountry, extinct in the male line seated at Dunster in 1375 and extinct in the junior male line seated at Mohuns Ottery in Devon at about the same time. He is recorded in the Domesday Book of 1086 as holding the manor of "Torre"
Dunster Castle Conygar Tower, was constructed by architect Richard Phelps to improve the view from the castle, and a larger park of 141 hectares (348 acres) was built just to the south of the castle, requiring the eviction of a number of tenant farmers. Henry's son, John, inherited the castle in 1780, but when his son, also called John, inherited in 1816 he chose to live in London instead, opening up Dunster Castle to the public. By 1845 the castle appeared to visitors to be past its prime: with only two of John's sisters living there and no horses or hunting dogs