William de Moyon

William I de Moyon (d. post 1090) (alias de Moion, also de Mohun), 1st feudal baron of Dunster in Somerset, was seigneur of Moyon in Normandy and became Sheriff of Somerset in 1086. He founded the English de Mohun family in the Westcountry. Recorded in the Domesday Book of 1086 as a tenant-in-chief of William the Conqueror holding a number of manors in Somerset with caput at Dunster Castle.

The Duchess of Cleveland wrote in her 1889 work Battle Abbey Roll about the origins of the de Mohun (alias Mohon, Moion, etc.) family:

He accompanied William, Duke of Normandy in the Norman conquest of England in 1066. Reputedly with forty-seven or fifty-seven of the greatest lords in the army. The Norman chronicler Wace called him le Viel, (modern French: le Vieux), "the elder", to distinguish him from his son William II de Mohun (d. circa 1155); for as William I de Moion the elder did not die until after 1090 he would not have been considered old in 1066.

He acquired sixty-eight manors in the west of England, one each in Devon, Wiltshire, eleven in Dorset, one of them Ham, which was inherited by his descendants, it was called Ham-Mohun, or Hammoon, and fifty-five in Somerset.

The estate connected to his caput at Dunster consisted of the ancient hundreds of Cutcombe and Minehead, land in Minehead, Cutcomb, and Dunster and some additions making a total 19,726 acres.

He bred horses both at Cutcomb and at Nunney, near Frome, sub-infeudated ( through one oh his tenants ), where unbroken brood-mares were kept.

Sheriff of Somerset from 1083 to 1086, his manor of Brompton-Ralph was called in contemporary records 'Brunetone Vicecomitis ("Brompton of the Viscount", i.e. Sheriff).

Dunster Priory

William de Moion is credited with founding Dunster Priory. Between 1090 and 1100 he granted the Church of St. George, at Dunster,( where part of the Norman building survives), land and tithes and a tenth of his mares, to the Abbey of St. Peter at Bath and to Bishop John de Villula (died 1122), to "build and exalt" the church.

Bath Abbey established at Dunster a cell of their own abbey under the rule of a prior. One of William's charters is recorded in a manuscript at Corpus Christi College, Cambridge. In this charter William declared his wish to be buried in Bath Abbey, not at Dunster.

The manors he held included: Minehead, West Quantoxhead and Combe Sydenham.

He married Adelisa, who bore him three sons, all surviving at the date of his grant to Bath Abbey:

• William II de Mohun, 1st Earl of Somerset (d. circa 1155), eldest son and heir was made a life peer Earl of Somerset in 1141.
• Geoffrey de Mohun;
• Robert de Mohun.