This book explores Maximus's Trinitarian theology, starting with his early works and then moving through the various stages of his writing to analyze how his theology developed in its Late Antique context. While Maximus's Trinitarian theology is inextricably linked with his Christology, this book offers a more nuanced account of their relationship and demonstrates how a broad set of traditions, concerns, and controversies gave a Trinitarian shape to his vision of Christian life and doctrine.