Theophilus of Antioch was a second-century Christian bishop who served as the Patriarch of Antioch from approximately 169 until 183. Born a pagan near the Tigris and Euphrates rivers, he converted to Christianity through the study of prophetic biblical texts. As a prominent leader, he was known for his zeal in defending the faith against various heretical movements. He contributed significantly to early Christian literature, specifically in the fields of apologetics, exegesis, and polemics, helping to establish a literary foundation for the Church during the late second century.