The Cambridge History of India, Vol. I: Ancient India v1.c24.129

v1.c24.129

From the Irānian side, if we may judge by the sources available, the evidence seems to be much stronger in favour of Persian influence upon India and modifying control over the northern part of the country than it is for a reverse influence of India upon Irān. Throughout ancient history, as indicated above (p. 321), Persia was the more aggressive power of the two. Yet it is uncertain how far the sphere of Irānian knowledge and authority in India may have extended prior to the time of the Achaemenian Empire, at which era our information takes on a more definite form. At no time, however, does the realm of Persian activity in this direction appear to have extended much beyond the limit of the Indus.