English Christendom has never been a static entity. Evangelism, politics, conflict and cultural changes have constantly and consistently developed it into myriad forms across the world. However, in recent times that development has seemingly become a general decline. This book utilises the motif of Christendom to illuminate the pedigree of Anglican Christianity, allowing a vital and persistent dynamic in Christianity, namely the relationship between the sacred and the mundane, to be more fundamentally explored. Each chapter seeks to unpack a particular historical moment in which the relations of sacred and mundane are on display. Beginning with the work of Bede, before focusing on the Anglo Norman settlement of England, the Tudor period, and the establishment of the church in the American and Australian colonies, Anglicanism is shown to consistently be a religio-political tradition. This approach opens up a different set of categories for the study of contemporary Anglicanism and its debates about the notion of the church. It also opens up fresh ways of looking at religious conflict in the modern world and within Christianity. This is a fresh exploration of a major facet of Western religious culture. As such, it will be of significant interest to scholars working in Religious History and Anglican Studies, as well as theologians with an interest in Western Ecclesiology.