Pontus was the northeast province of Asia Minor, bordering on the Black Sea. What led Eusebius to suppose that this epistle was addressed to the church in Pontus, we do not know. The letter is addressed to the church in Philomalium, and that city was not Pontus (according to Lightfoot, ibid. II. p. 948). Valesius suggests that we should read π€ντα τόπον instead of Πόντον, but the latter reading is confirmed both by Rufinus and by the Syriac as well as by all the Greek mss. I am inclined to think that Eusebius may have read hastily and erroneously in the heading of the letter Πόντον instead of π€ντα τόπον, and, not knowing that Philomelium was not in Pontus, never thought that his reading was incorrect. Such careless mistakes are by no means uncommon, even in these days, and, having once written Pontus, it is easy enough to suppose that nothing would occur to call his attention to his mistake, and of course no copyist would think of making a correction.