St Maximus the Confessor is one of the giants of Christian theology. His doctrine of two wills gave the final shape to ancient Christology and was ratified by the Sixth Ecumenical Council in AD 681. This study throws new light upon one of the most interesting periods of historical and systematic theology. Its focus is the seventh century, the century that saw the rapid expansion of Islam, and the Empire's failed attempt to retain many of its south-eastern provinces by inventing and promoting the heresy of Monothelitism (only one will in Christ) as a bridge between the Byzantine Church and the...