The oldest inscriptions in Old Indic, the language of the Rig Veda, is found not in India, but in northern Syria in Hittite records regarding one of their neighbors, the Hurrian-speaking Mitanni. In a treaty with the Hittites, the king of Mitanni, after swearing by a series of Hurrian gods, swears by the gods Mitrašil, Uruvanaššil, Indara, and Našatianna, who correspond to the Vedic gods Mitra, Varuna, Indra, …

The earliest Indo-Aryan migration to Assam is estimated to have occurred between the 2nd century BCE and 1st century CE —not earlier than 500 BCE. The earliest epigraphic record suggests that the Indo-Aryan migration began latest by the middle of the 4th century CE. They came from the Gangetic Plains into a region already inhabited by people who spoke Austroasiatic and Tibeto-Burmanl…