A world where Muhammad does not found Islam and converts to Christianity, the Byzantine Empire is not inferior to the conquerors of Syria, Palestine, Egypt and North Africa, and Persia remains a great power capable of competing on equal terms with Byzantium. In such a world lives the main character, Vasily Argyros, a soldier and agent of the empire, who has gone from a commander of scouts in the Roman army to a master of Constantinople. “Agent of Byzantium” is rightfully considered one of the best novels of the writer, moreover, one of the best works written in the genre “alternative history.”