In this study Charles Raith II fills a gap in Reformation-era scholarship by analysing Calvins teaching on works and reward in light of medieval theological developments surrounding the doctrine of merit. While significant analysis has been given to Calvins doctrine of justification, its relation to sanctification, the notion of union with Christ, and the role of participation, there is as yet no sustained analysis of how these teachings are shaped by the most hostile and pervasive of his polemics, namely, his confrontation with a merit-based framework for understanding Christian salvation. This volume, however, interprets Calvins own theological constructions as contextually determined by the reigning polemics of his day. In addition, previous scholarship on these topics has largely failed to properly contextualise Calvins own thought against the background of scholastic theological developments -- developments that Calvin both accepts and rejects in the formulation of his own theology. After Merit addresses these gaps by (1) analysing Calvins tracts, scriptural commentaries and Institutes to demonstrate Calvins unique distain for the doctrine of merit among the early Reformers and the pervasiveness of this polemic within his theological program; (2) reviewing the scholastic developments surrounding the doctrine of merit from the High to Late Middle Ages as background to Calvins thought; (3) highlighting Calvins principle problems with the doctrine of merit: the competitive-causal schema between divine and human causality, merit as a basis for justification, and good works as deserving of reward; and (4) unpacking Calvins theology of justification, sanctification, the worth of works, and the role of works in salvation as an alternative to the opponents doctrine of merit. The volume concludes by reflecting on the reception of Calvins theology of works and reward in later Reformed thought.