Heidegger's Bible Handbook: Titus: Subscript
4. Whether it was written at Nicopolis?
That this Epistle was written at Nicopolis, appears to some to be indicated by Titus 3:12. Yet, there was one Nicopolis in Macedonia, another in Epirus, another in Armenia minor, another in Cilicia, another in Egypt, as Strabo and other Geographers teach us. It is uncertain which is here understood. The Greek Subscript holds that it was written ἀπὸ Νικοπόλεως Μακεδονίας, from Nicopolis of Macedonia. But the Syriac does not have this. And it is able to be doubted, whether this was written from any Nicopolis. For Paul writes in the passage cited, Come to me to Nicopolis, ἐκεῖ γὰρ κέκρικα παραχειμάσαι, for I have determined to winter there: not ἐνταῦθα/here. He was not, therefore, writing at Nicoplis, but he had only traveled there, so that he might winter there.
 In north-western Greece.  In south-eastern Asia Minor.