This is the first detailed study of the career of one of the most important medieval archbishops of Canterbury. Robert Winchelsey sought to defend ecclesiastical rights and liberties at a time when the English Church was under constant pressure from the king and his government, and he suffered suspension from office as a result of his opposition to Edward I. The theme of the book is the relationship of this learned and saintly archbishop with the Crown during the last troubled years of Edward I's reign and the first equally troubled years of Edward II's reign.