Eminent theologian Jaroslav Pelikan has been translating, editing, and studying the Christian creeds and confessions of faith for sixty years. This book is the historical and theological distillation of that work. In Credo, Pelikan addresses essential questions about the Christian tradition: the origins of creeds; their function; their political role; how they relate to Christian institutions, worship, and service; and how they help to explain the major divisions of the Christian church and of Christian history. Credo stands as an independent reference work devoted to the subject of what creeds and confessions are and what their role in history has been. It is also the first of the four volumes of Creeds and Confessions of Faith in the Christian Tradition, edited by Pelikan and Valerie Hotchkiss.