Strabo, Geography

As for Pontus, Mithridates Eupator established himself as king of it; and he held the country bounded by the Halys River as far as the Tibarani and Armenia, and held also, of the country this side the Halys, the region extending to Amastris and to certain parts of Paphlagonia. And he acquired, not only the seacoast towards the west a far as Heracleia, the native land of Heracleides the Platonic philosopher, but also, in the opposite direction, the seacoast extending to Colchis and lesser Armenia; and this, as we know, he added to Pontus. And in fact this country was comprised within these boundaries when Pompey took it over, upon his overthrow of Mithridates. The parts towards Armenia and those round Colchis he distributed to the potentates who had fought on his side, but the remaining parts he divided into eleven states and added them to Bithynia, so that out of both there was formed a single province. And he gave over to the descendants of Pylaemenes the office of king over certain of the Paphlagonians situated in the interior between them,¹ just as he gave over the Galatians to the hereditary tetrarchs. But later the Roman prefects made different divisions from time to time, not only establishing kings and potentates, but also, in the case of cities, liberating some and putting others in the hands of potentates and leaving others subject to the Roman people. As I proceed I must speak of things in detail as they now are, but I shall touch slightly upon things as they were in earlier times whenever this is useful. I shall begin at Heracleia, which is the most westerly place in this region.