‘Establishing the Church’ charts the gradual emergence of the Church of England over the course of the sixteenth century. The Act of Supremacy gave Henry VIII the powers of the Pope, but left much of church doctrine and liturgy unreformed. The regency of Edward VI made possible a more determined Protestant reformation, typified in the Book of Common Prayer. Mary's reign placed strain upon the obligation of obedience to the monarch, but under Elizabeth a settlement between Calvinist austerity and the remains of Catholicism was forged. Sixteenth-century defences of Anglicanism rested on parliament's exercise of scriptural authority to purge Roman errors.