During the 16th century, Europe underwent fundamental sociopolitical changes, which challenged theologians and the church to respond theologically. In light of the celebration of the Reformation (1517–2017) and the theme of this conference, this contribution presents Calvin as a ‘public theologian’. To this purpose it is necessary to define ‘public theology’, describe the sociopolitical changes which challenged theologians during the 16th century, and lastly to focus on Calvin’s contribution to the discourse. Because of the vast amount of material that is available, this contribution is limited to Calvin’s first publication, his ‘Commentary on Seneca’s De Clementia’. Calvin’s fundamental understanding of law and justice, as well as his theo...