One thing which militates against a concise pigeon-holing of such information as we can gather into this brief review of Indian history, is the fact that much of it has really nothing to do with India at all. The Hindoo Kush range of mountains may be taken as the western boundary of Asôka's empire, and the powers which encroached on that empire matured their plans, conquered and governed such provinces as they gained from beyond that boundary. The Bactrians, for instance, who appeared on the banks of the Indus, came from the valleys and fertile plains about the Oxus. They were a semi-civilised, semi-Hellenised race, who boasted the possession of a thousand cities. The Parthians, on the other hand, hailed from the wide steppes about the Caspian Sea, and were barbarian utterly in the sense of not caring for either luxury or culture. Mounted shepherds, mere moss-troopers, they were a hardy race, and under the leadership of Arsakes, gripped at the crown of Central Asia, and so, inevitably, after a time reached out to the fat lands about the Indus; for the most part leaving the princelings who parcelled out the land in possession, as feudatories to the foreign power. It will be remembered that Seleukos Nikator's attempt to recover India for Greece in Chandra-gûpta's time failed. Thenceforward for a hundred years no other attempt was made. In B.C. 206, however, Antiochus the Bactrian made a sweep on Kandahâr, and Demetrios, his son, in B.C. 190, following his example, captured both the Punjâb and Sinde. To his own cost, however; for, weakened by these distant wars, he had to yield his throne to one Eukratides, and be content for a time with the title of "King of the Indians." Not for long, however, for Eukratides, being bad to beat, eventually got a grip even on these eastern provinces.