The 9th-century Irish scholar Johannes Scottus Eriugena's main work, Periphyseon (de devisione naturae) is a remarkable attempt at an intellectual synthesis between the Bible and neoplatonist philosophy. O'Meara has brought together the results of the most recent research in this study of Eriugena's Irish background, life in France, and career as a teacher, controversialist, translator, and poet. The book also contains an extended and careful summary of the Periphyseon and the first translation into English of the Homily on the Prologue to St. John's Gospel