Chapter 22 considers an attempt to secure some degree of rapprochement between Catholics and Protestants as rising tensions seemed to point towards an irreversible fissure within western Christianity. Aware of the significance of the divisions over the nature of justification and justifying righteousness, a group of Catholic and Protestant theologians met to discuss these at the Regensburg Colloquy (also known as the Colloquy of Regensburg) in April and May 1541. This chapter considers the positions that were represented at this Colloquy, and the outcomes of their deliberations. The importance of the Colloquy rests in part on first-hand accounts and explanations of the theological concerns about justification from each side of the debate. Although the Colloquy secured an informed and balanced way of approaching the doctrine of justification, its outcome was inconclusive, and unable to prevent a final rupture between Catholic and Protestant.