KRDS lects
The KRDS lects (or the Kamta, Rajbanshi, Deshi and Surjapuri subgroup) are a cluster of modern lects that are phylogenetic descendants of the proto-Kamta language. The proto-Kamta language began differentiating after 1250 around Kamatapur, the capital city of Kamata kingdom, as the western branch of the Kamarupi Prakrit, whereas the eastern branch developed into Early Assamese.