Reginald Lane-Poole, Dictionary of National Biography… (1890)
“ GREY, WILLIAM (d. 1478) , bishop of Ely and high treasurer, was a member of the family of Lord Grey of Codnor (H. Savage, Balliofergus, p. 109, Oxford, 1668; Godwin, De Præsulibus, ed. Richardson, i. 268) , possibly a son of Richard de Grey (d. 1419) [q. v.] , and a younger brother of John and Henry Grey, who succeeded in turn to the barony, and who were born respectively about 1399 and 1406. William Grey was educated at Balliol College, Oxford, and in due course became a doctor of divinity in that university. His powerful family connections early secured him ecclesiastical preferment. ”
