This book radically reassesses the reform of the Irish Church in the twelfth century, on its own terms and in the context of the English Invasion that it helped precipitate. Professor Ó Corráin sets these profound changes in the context of the pre-Reform Irish church, in which he is a foremost expert. He re-examines how Canterbury's political machinations drew its archbishops into Irish affairs, offering Irish kings and bishops unsought advice, as if they had some responsibility for the Irish church: the author exposes their knowledge as limited and their concerns not disinterested. The Irish Church, its Reform and the English Invasion considers the success of the major reforming synods in giving Ireland a new diocesan structure, but equally how they failed to impose marriage reform and clerical celibacy, a failure mirrored elsewhere.

The Rise and Fall of Christian Ireland describes the emergence, long dominance, sudden division, and recent decline of Ireland's most important religion, as a way of telling the history of the island and its peoples. Throughout its long history, Christianity in Ireland has lurched from crisis to crisis. Surviving the hostility of earlier religious cultures and the depredations of Vikings, evolving in the face of Gregorian reformation in the eleventh and twelfth centuries and more radical protestant renewal from the sixteenth century, Christianity has shaped in foundational ways how the Irish have understood themselves and their place in the world. And the Irish have shaped Christianity, too. Their churches have staffed some of the religion's most important institutions and developed some of its most popular ideas. But the Irish church, like the island, is divided. After 1922, a border marked out two jurisdictions with competing religious politics. The southern state turned to the Catholic church to shape its social mores, until it emerged from an experience of sudden-onset secularization to become one of the most progressive nations in Europe. The northern state moved more slowly beyond the protestant culture of its principal institutions, but in a similar direction of travel. In 2021, 1,500 years on from the birth of Saint Columba, Christian Ireland appears to be vanishing. But its critics need not relax any more than believers ought to despair. After the failure of several varieties of religious nationalism, what looks like irredeemable failure might actually be a second chance. In the ruins of the church, new Patricks and Columbas shape the rise of another Christian Ireland.

The twelfth century saw a wide-ranging transformation of the Irish church, a regional manifestation of a wider pan-European reform movement. This book, the first to offer a full account of this change, moves away from the previous concentration on the restructuring of Irish dioceses and episcopal authority, and the introduction of Continental monastic observances, to widen the discussion. It charts changes in the religious culture experienced by the laity as well as the clergy and takes account of the particular Irish experience within the wider European context. The universal ideals that were defined with increasing clarity by Continental advocates of reform generated a series of initiatives from Irish churchmen aimed at disseminating reform ideology within clerical circles and transmitting it also to lay society, even if, as elsewhere, it often proved difficult to implement in practice. Whatever the obstacles faced by reformist clergy, their genuine concern to transform the Irish church and society cannot be doubted, and is attested in a range of hitherto unexploited sources this volume draws upon. Marie Therese Flanagan is Professor of Medieval History at the Queen's University of Belfast.

The thousand years explored in this book witnessed developments in the history of Ireland that resonate to this day. Interspersing narrative with detailed analysis of key themes, the first volume in The Cambridge History of Ireland presents the latest thinking on key aspects of the medieval Irish experience. The contributors are leading experts in their fields, and present their original interpretations in a fresh and accessible manner. New perspectives are offered on the politics, artistic culture, religious beliefs and practices, social organisation and economic activity that prevailed on the island in these centuries. At each turn the question is asked: to what extent were these developments unique to Ireland? The openness of Ireland to outside influences, and its capacity to influence the world beyond its shores, are recurring themes. Underpinning the book is a comparative, outward-looking approach that sees Ireland as an integral but exceptional component of medieval Christian Europe.