Naranarayan was the last ruler of the undivided Koch dynasty of the Kamata Kingdom. He succeeded his father, Biswa Singha. Under him the Koch kingdom reached its cultural and political zenith. Under his rule, and under the military command of his brother Chilarai, he was able to subjugate the entire Brahmaputra valley, including the Ahom kingdom; besides the Kachari, Tripura kingdoms, as well as the Khyrem, Jaintia and others. This influence was halted when he faced Suleman Karranni, the Sultan of Bengal.

Srimanta Sankardev was a 15th–16th century Assamese polymath; a saint-scholar, poet, playwright, dancer, actor, musician, artist social-religious reformer and a figure of importance in the cultural and religious history of the Bhakti movement in Assam. He is credited with building on past cultural relics and devising new forms of music (Borgeet), theatrical performance, dance (Sattriya), literary language (Brajavali). Besides, he has left a literary oeuvre of trans-created scriptures, poetry and theological works written in Sanskrit, Assamese and Brajavali. The Bhagavatic religious movement he started, Ekasarana Dharma and also called Neo-Vaishnavite movement, influenced two medieval kingdoms – Koch and the Ahom kingdom – and the assembly of devotees he initiated evolved over time into monastic centers called Sattras, which continue to be important socio-religious institutions in Assam and to a lesser extent in North Bengal.