Cox was born of obscure parentage at
Whaddon, Buckinghamshire, in 1499 or 1500. He was educated at the
Benedictine Snelshall Priory near Whaddon, at
Eton, and at
King's College, Cambridge, where he graduated B.A. in 1524. At
Cardinal Wolsey's invitation he became a member of the Cardinal's new foundation at
Oxford, was incorporated B.A. in 1525, and created M.A. in 1526. In 1530 he was engaged in persuading the more unruly members of the university to approve of the
King's divorce. A premature expression of
Lutheran views is said to have caused his departure from Oxford and even his imprisonment, but the records are silent on these sufferings which do not harmonise with his appointment as Master of the Royal Foundation at Eton. In 1533 he appears as the author of an ode on the coronation of
Anne Boleyn, in 1535 he graduated B.D. (Bachelor of Divinity) at Cambridge, proceeding D.D. (Doctor of Divinity) in 1537, and in the same year subscribing the
Institution of a Christian Man. In 1540 he was one of the fifteen divines to whom were referred crucial questions on the sacraments and the seat of authority in the Church; his answers (printed in Pocock's
Burnet, iii. 443–496) indicate a mind tending away from
Catholicism, but susceptible to "The King's Doctrine"; and, indeed, Cox was one of the divines by whom Henry said the "King's Book" had been drawn up when he wished to impress upon the
Regent Arran that it was not exclusively his own doing. Moreover, he was present at the examination of
Robert Barnes, subscribed the divorce of
Anne of Cleves, and in that year of reaction became Archdeacon and Prebendary of Ely and Canon of Westminster. to Cox, 1546 He was employed on other royal business in 1541, was nominated to the projected
Bishopric of Southwell, and was made King's Chaplain in 1542. In 1543 he was employed to ferret out the "
Prebendaries' Plot" against
Thomas Cranmer, and became the Archbishop's chancellor. In December, he was appointed Dean of
Oseney (afterwards
Christ Church)
Oxford, and in July was made Almoner to Prince Edward, in whose education he took an active part. He was present at
Edward Crome's recantation in 1546, denounced it as insincere and insufficient, and severely handled him before the Privy Council. ==Under Edward VI==