The Aryan Invasion is one of the biggest and most influential interactions that has associated with classical India. Although most of what historians know about this invasion is only theoretical, there is substantial evidence that supports their theories. According to these theories, classical India was invaded, culturally, by Indo-European tribes from Central Asia.
This so-called pre-Aryan civilization is said to be evidenced by the large urban ruins of what has been called the "Indus valley culture" (as most of its initial sites were on the Indus river). The war between the powers of light and darkness, a prevalent idea in ancient Aryan Vedic scriptures, was thus interpreted to refer to this war between light and dark skinned peoples. The Aryan invasion theory thus turned the "Vedas", the original scriptures of ancient India and the Indo-Aryans, into little more than primitive poems of uncivilized plunderers.