We should, in other words, seriously consider the possibility that the new religious and cultural synthesis, represented by the Rigveda was essential… - Colin Renfrew

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We should, in other words, seriously consider the possibility that the new religious and cultural synthesis, represented by the Rigveda was essentially a product of the soil of India and Pakistan, and that it was not imported, ready-made, on the back of the steeds of the Indo-Aryans. Of course, it evolved while in contact with the developing cultures of other lands, most notably Iran, so that by a process of peer polity interaction, cultures and ideologies emerged which in many ways resembled each other. It is not necessary to suggest that one was borrowed, as it were, directly from the other.