Roman civil wars
The extension of the Taulantii to the limits of the Apollonian territory is not very clear in the data provided by Pseudo-Skylax. The southern border of the Taulantii was likely the Seman river, while the northern border was marked by the Mat river. Livy and Pliny located them in the same place, but according to Ptolemy, "Aulon" (Vlorë) was in Taulantian territory, which implies an extension of this people towards the south including the territory of Apollonia. In Roman times such a southward extension was not possible before the end of the Roman civil wars, which involved this area.