Austroasiatic , Tibeto-Burman , Magadhan Prakrit ) in the ancient Kamarupa and in the medieval kingdoms of Kamatapur, Kachari , Cuteeya , Borahi, Ahom and Koch . Traces of the language is found in many poems by Luipa, Sarahapa, etc in Charyapada (c.7th-8th AD). Modern dialects Kamrupi, Goalpariya, etc are the