The Cambridge History of India, Vol. I: Ancient India v1.c31.8

v1.c31.8

The Scythian (Çaka) settlements, which can only have been the result of invasions along this route, gave to the region of the Indus delta the name ‘Scythia’ or ‘Indo-Scythia’ by which it was known to the Greek geographers, and the name ‘Çaka-dvīpa’ or ‘the river country of the Çakas’ as it appears in Indian literature. This region still continued to be governed by the Pahlavas, who are inseparably connected with the Çakas, at the end of the first century a.d.² There can be little doubt that Indo-Scythia was the base from which the Çaka and Pahlava armies moved up the valleys of the Indus and its tributaries to attack the Yavana kingdoms of the successors of Euthydemus and Eucratides.