 After spending some time at Jesus College, Oxford without taking a degree, he entered the Inner Temple in November 1631 but left in July 1632 on the death of his father to take control of the family estate at Lleweni Hall, Denbighshire.He was a member of the commission of the peace for Flintshire and Denbighshire, Wales and was elected to the common council of the Denbigh corporation in 1632.He was MP for Denbighshire in the Short Parliament of 1640, but said little; his relative Sir Thomas Myddleton succeeded him in the Long Parliament.