This work examines key aspects of the development of the Heidelberg Catechism, including historical background, socio-political origins, purpose, authorship, sources, and theology. The book includes the first ever English translations of two major sources of the Heidelberg Catechism–Ursinus’s Smaller and Larger Catechisms–and a bibliography of research on the document since 1900. Students of the Reformed tradition and the Protestant Reformation will value this resource.