SIR JOHN DE WYDEVILL, son and heir, was of age already in 1362. Presumably by his 1st marriage he acquired lands and interests in Beds and Bucks. He was escheator in Beds and Bucks, 1379-80, and in Northants and Rutland, 1382-83; sheriff of Northants, 1380, 1385, 1390; of Beds and Bucks, 1383; J.P., Northants, 1381-403; Knight of the shire, Northants, in five parliaments between 1382 and 1390. From 1384 onwards he took part in numerous commissions of oyer and terminer, &c.
He married, 1stly, Katharine, presumably daughter and heir of Sir John FERMBAND of Biddenham, Beds. He married, 2ndly, before 1379, Isabel Godard, widow of Robert PASSELAW of Drayton Parslow. He died probably soon after 8 September 1403. [Complete Peerage XI:16, XIV:549, (transcribed by Dave Utzinger)]