Abstract: The works of Ambrosiaster, a Christian writing in Rome in the late 4th century, were influential on at the time and throughout the Middle Ages. This book starts by addressing the problem of the author's mysterious identity (which scholars have puzzled over for centuries) and places him in a broad historical and intellectual context. Later, it addresses Ambrosiaster's political theology, an idea which has been explored in other late Roman Christian writers but which has never been addressed in his works. The book also looks at how Ambrosiaster's attitudes to social and political order were formed on the basis of theological concepts and the interpretation of scripture, and shows that he espoused a rigid hierarchical and monarchical organization in the church, society, and the Roman empire. He also traced close connections between the Devil, characterized as a rebel against God, and the earthly tyrants and usurpers who followed his example.

Keywords: Rome, late 4th century, Middle Ages, political theology, late Roman Christian writers, church, society, Roman empire, God, Devil