Koch-Rajbongshis are one of the indigenous groups of people of Asian continent belonging to the Mongolian stock, who traversed in different places of Asia from the pre-Vedic and pre-historic period to the present century. During the Vedic and epic age they were frequently referred as Asurs, Mlechachas, Kiratas, Non-Aryan, Pani-Koches and Kuvacha in Purans and Tantras.The people of this community are now spread over three countries i.e. India, Nepal and Bangladesh.
Kamatapur is the ancient Koch Kingdom and the present divided Kamatapur included entire North-Bengal, most of the parts of present Assam and adjoining parts of Bihar, Nepal, Bhutan and the present parts of ancient Rangpur of Bangladesh.
The establishment of Koch-Rajbongshi power gave a strong impetus to the sanskritization process of Koch-Rajbongshis while Biswasingha became a patron of Hinduism and later his son Naranarayan. It’s seen that the golden tradition of Koch-Kingdom started from Biswasingha (1515).
The Koch-Rajbongshis have ruled in the respective region for several hundred of years and they were gradually known as Rajbongshis. The Rajbongshi language flourished during this period. However after the fall of Koch king Naranarayana and his brother Chila Ray their successors could not retain such a dominant status.
This historically glorious community is very rich in cultural heritage. In every field of social and cultural aspect they cherish individual traits which represent their identity in the postmodern context. They do have an individual language, a composite behavior pattern, social life, traditional dress, food habit, folk song, dances and occasional festivals. The culture of Koch-Rajbongshi community in its indigenous form represents the tribal ancestry of the community