The main idea used to interpret the ancient history of India, which we still find in history books today, is the theory of the Aryan invasion. According to this account, which I will briefly summarize, India was invaded and conquered by nomadic light-skinned Indo-European tribes (Aryans) from Central Asia around 1500-1000 BC. They overran an earlier and more advanced dark-skinned Dravidian civilization from which they took most of what later became Indian civilization.
In the process they never gave the indigenous people whom they took their civilization from the proper credit but eradicated all evidence of their conquest. All the Aryans really added of their own was their language (Sanskrit, of an Indo-European type) and their priestly cult of caste that was to become the bane of later Indic society.
Author : David Frawley