This is on the basis of the Aryan invasion theory according to which 'Aryans' invaded India in the early second millennium BC, and conquered it from the 'natives'. This theory is based purely on an eighteenth century linguistic proposition, and has no basis either in archaeology, or in literature, or in the racial-ethnic composition of India. What concerns us more, so far as this present volume is concerned, is the attempt to brand Hindu religious texts, on the basis of this theory, as 'invader' texts: a UNESCO publication characterises the Rigveda as 'the epic of the destruction of one of the great cultures of the ancient world.'
Shrikant Talageri, The Rigveda: A Historical Analysis, 2000.