Strabo, Geography
H.C. Hamilton, Esq., W. Falconer, M.A., Ed.

Disturbances having arisen in the countries beyond the Taurus in consequence of the kings of Syria and Media, who possessed the tract of which we are speaking, being engaged in other affairs,¹ those who were intrusted with the government of it occasioned first the revolt of Bactriana; then Euthydemus and his party the revolt of all the country near that province. Afterwards Arsaces, a Scythian, (with the Parni, called nomades, a tribe of the Dahæ, who live on the banks of the Ochus,) invaded Parthia, and made himself master of it. At first both Arsaces and his successors were weakened by maintaining wars with those who had been deprived of their territory. Afterwards they became so powerful, in consequence of their successful warfare, continually depriving their neighbours of portions of their territory, that at last they took possession of all the country within the Euphrates. They deprived Eucratidas, and then the Scythians, by force of arms, of a part of Bactriana. They now have an empire comprehending so large an extent of country, and so many nations, that it almost rivals that of the Romans in magnitude. This is to be attributed to their mode of life and manners, which have indeed much of the barbarous and Scythian character, but are very well adapted for establishing dominion, and for insuring success in war.