He was a prominent reformer in the college, in a group that included Thomas Cooper, Robert Crowley and John Foxe.
[1][2] When Mary I of England came to the throne later in 1553, Bull, with the help of Thomas Bentham, snatched a censer from the hand of the officiating priest and was expelled from Magdalen.
He was also the editor of Christian Praiers and Holy Meditacions which appeared first by 1570; an earlier work from Bull's collection was Lidley's Prayers (1566).
[2] The major martyrological collection, Certain Most Godly, Fruitful and Comfortable Letters of such True Saintes and Holy Martyrs as in the Late Bloodye Persecution Gave their Lyves, was published in 1564, as by Miles Coverdale.
[3] Bull translated from Martin Luther A Commentarie on the Fiftene Psalmes called Psalmi Graduum, printed by Thomas Vautroullier (1577), with a preface by Foxe.