Theophilus (4), bp. of Antioch (Eus. H. E. iv. 20; Hieron. Ep. ad Algas. quaest. 6), succeeded Eros c. 171, and was succeeded by Maximin c. 183, according to Clinton (Fasti Romani), but the dates are only approximations. His death may probably be placed c. 183–185 (Lightfoot, S. Ignatius, vol. ii. p. 166). We gather from his writings that he was born a heathen, not far from the Tigris and Euphrates, and was led to embrace Christianity by studying the Holy Scriptures, especially the prophetical books (ad Autol. i. 14, ii. 24). He makes no reference to his office in his existing writings, nor is any other fact in his life recorded. Eusebius, however, speaks of the zeal which he and the other chief shepherds displayed in driving away the heretics who were attacking Christ's flock, with special mention of his work against Marcion (H. E. iv. 24). He was a fertile writer in different departments of Christian literature, polemics, exegetics, and apologetics. Dr. Sanday describes him as "one of the precursors of that group of writers who, from Irenaeus to Cyprian, not only break the obscurity which rests on the earliest history of the Christian church, but alike in the East and in the West carry it to the front in literary eminence, and distance all their heathen contemporaries" (Studia Biblica, p. 90). Eusebius and Jerome mention numerous works of Theophilus current in their time. They are (1) the existing Apology addressed to Autolycus; (2) a work against the heresy of Hermogenes; (3) against that of Marcion; (4) some catechetical writings; (5) Jerome also mentions having read some commentaries on the gospel and on Proverbs, which bore Theophilus's name, but which he regarded as inconsistent with the elegance and style of his other works.