To understand the cult of the Virgin Mary is to understand the Christian religion. The Virgin Mary is a ubiquitous but enigmatic presence in Christian history and culture. The tradition about Mary forms a vast and multi-layered aspect of Western history, culture and spirituality. It is not just in the Catholic tradition that Mary has become a particular focus of study and interest. Mary has also become a crucial interest for Christians outside this tradition (Protestant, Anglican) as a path to ecumenical understanding.This book is intended as a reference book for the student or scholar seeking knowledge of the history and contemporary practice of the cult of the Virgin Mary. It provides new essays which give overviews of particular areas of study - both historical and thematic - together with texts from primary sources and important scholarly articles, some of which appear in English for the first time.The volume is designed to be suitable for use as a course book at undergraduate and Masters levels. The result is astonishing and will open up whole new avenues for theological and spiritual enquiry. "Mary: The Complete Resource" is essential for anyone who has a strong theological or devotional interest in Mary. But it will open the eyes of those who do not.