Baron Mohun of Okehampton

The family was formerly seated at Hall in the parish of Lanteglos-by-Fowey in Cornwall, and was a junior branch of the Mohun family, feudal barons of Dunster, of Dunster Castle in Somerset, of whom the first member, the warrior William de Moyon (died post 1090), had come over with William the Conqueror during the Norman Conquest of 1066.

also in the parish of Lanteglos-by-Fowey and later at Boconnoc, both in Cornwall, and was one of the four co-heirs of Edward Courtenay, 1st Earl of Devon (1527–1556), feudal baron of Plympton, feudal baron of Okehampton, etc., of Tiverton Castle, Okehampton Castle, etc., the last of the old Courtenay Earls of Devon.

The great-grandson of the latter was Edward Courtenay, 1st Earl of Devon (1527–1556), who died without progeny, one of whose co-heirs was his distant cousin Sir Reginald Mohun (born 1509) of Hall, great-grandson of Elizabeth Courtenay and William Mohun.

[1] Sir Reginald Mohun subsequently sat as Member of Parliament for East Looe and Lostwithiel.

In 1639, eleven years after his elevation to the peerage, Lord Mohun of Okehampton succeeded his father in the baronetcy.