St Maximus the Confessor, the greatest of Byzantine theologians, lived through the most catastrophic period the Byzantine Empire was to experience before the Crusades. This book introduces the reader to the times and upheavals during which Maximus lived. It discusses his cosmic vision of humanity and the role of the church. The study makes available a selection of Maximus\' theological treaties many of them translated for the first time. The translations are accompanied by a lucid and informed introduction.