Kin of Mellcene Thurman Smith
Baron of Oakhampton
John de Courtenay was Baron of Oakhampton, and in 27th of Henry III (1246) paid 100 marks for his relief, and doing homage had livery of all his lands, but it does not appear that he was ever summoned to Parliament. He was employed on several important services in Henry III's reign and was also a great benefactor of the monks of Ford Abbey. He died May 3, 1273 and was buried near his father in the Abbey. He married Isabel (daughter of Hugh de Vere, Earl of Oxford, and his wife Hawise, daughter of Saire de Quincey, Surety for the Magna Charta, son of Robert de Vere, 3rd Earl of Oxford, Surety for the Magna Charta), and had one son, Hugh. His lady surviving him married 2nd Lord Dinham.
The cited information was sourced from Book (Ref: Page: 284)