In the past three decades the early modern reception of the church Fathers has increasingly received scholarly attention. Most of these studies have focused on the fortune of individual Fathers or on the readings of specific reformers. This book adopts a very welcome thematic perspective, exploring the appeal to patristic authority in one of the key problems in Reformation theology: the nature of the eucharist. It concentrates in particular on three clusters of debate which neatly reflect the confessional developments in the sixteenth-century Protestant world, starting with the 1529 Colloquy of Marburg (ch. i), followed by Calvin's debates with the Lutherans Joachim Westphal and Tilemann Hesshusen (chs ii–v), and concluding with the Colloquy of Montbéliard in 1586 (ch. vi). In her conclusion Chung-Kim argues that the Protestant reformers used the Fathers to create ‘a “new” ancient tradition’, turning these ancient authorities into ‘authenticators of the Protestant tradition’ (p. 143). An important merit of Chung-Kim's treatment is her careful attention to the varied political contexts of these doctrinal debates. Each chapter opens with extensive historical introductions including, where relevant, biographical vignettes of the proponents of the debate. This makes the work a useful contribution to the interpretation of eucharistic theology in the Protestant Reformations. Readers interested in the workings of intellectual authority may find the book less helpful on a more general conceptual level. Although Chung-Kim notes that the need for authority emerges ‘precisely in the midst of polemical debates’ (p. 98) and that the sources were increasingly ‘limited to speaking those words that the reformers gave them’ (p. 140), her account is more concerned with the invention of tradition than with the invention of authority. Yet this will not, of course, make the evidence that Chung-Kim offers any less interesting for historians of Reformation theology.