The Anatolian hypothesis suggests that the speakers of the Proto-Indo-European language (PIE) lived in Anatolia in the Neolithic, and associates the distribution of historical Indo-European languages with the expansion during the Neolithic revolution during the 7th and 6th millennia. For this theory to be consistent with Indo-Aryan presence in India during the Mature Harappan period (as is often postulated by Indian patriotic sentiment), the Indo-Iranians would have had to migrate east around 3000 BC, reaching the Indus Valley before 2600 BC. The Iranians could have migrating back west after 1900 BC.
