Edward Courtenay of Haccomb, or Boconnoc, aforesaid 16th Earl of Devon, had four sisters, as is set down in his will, dated 1509, in the first year of the reign of King Henry VIII. which were thus disposed of in marriage, Elizabeth was married to John Trethyrfe of Trethyrfe, from whom Courtenay of that place, and Vyvyan of Trelowarren is descended; Maud to John Arundell of Tolverne, from whom the Arundells of Sythney, and by females the Trefusis of Trefusis, and the Halses late of Fentongollan are descended: Isabel, the third daughter, was married to William Moune, from whom the Lord Mohun descended: Florence, the fourth sister, was married to John Trelawney, from whom the Trelawneys of Trelawne are descended.
Whether this lordship of Boconnoc fell to the Crown by attainder of treason, upon the death of Henry Courtenay, Marquis of Exeter, or was purchased from the Crown, or of the sisters and heirs of the said Edward Courtenay, by Carmenow of Fengollan, I know not; he sold it to the Earl of Bedford; as the said Francis Russell, Earl of Bedford sold it, in 1566, to Reginald Mohun, Esq. (son or grandson of William Moune, who married Isabel Courtenay aforesaid) that married Joan daughter of Sir William Trevanion, Knt. whose son, Sir Mohun, Knt. married Joan, one of the sisters and coheirs of Sir John Horsey, Knt. by whom he had issue, Sir Reginald Mohun, Knt. that married two wives; the first, Sir William Killigrew's daughter; the second, a daughter of Heale, of Wembury in Devon; the which Sir Reginald, 15 November 1612, was created a Baronet of England, temp. James I. and had issue, John Mohun, Esq. who in the lifetime of his father was created Baron Mohun of Oakhampton in right of his grandmother Isabel , sister of Edward Courtenay, the l6th Earl of Devon, lord of the manor, honour, and borough of Oakhampton, who married and had issue Warwick Lord Mohun, who had issue Charles Lord