Dimasa Kingdom aka Kachari kingdom

The Dimasa Kingdom also known as Kachari kingdom was a late medieval/early modern kingdom in Assam, Northeast India ruled by Dimasa kings. The Dimasa kingdom and others (Kamata, Chutiya) that developed in the wake of the Kamarupa kingdom were examples of new states that emerged from indigenous communities in medieval Assam as a result of socio-political transformations in these communities. The kingdom's agrarian base included settled wet-rice cultivation in the fertile riverine tracts of central and eastern Assam. The British finally annexed the kingdom: the plains in 1832 and the hills in 1834. This kingdom gave its name to undivided Cachar district of colonial Assam. After independence, the undivided Cachar district was split into three districts in Assam: Dima Hasao district (formerly North Cachar Hills), Cachar district, Hailakandi district. The Ahom Buranjis called this kingdom Timisa. 

In the 18th century, a divine Hindu origin was constructed for the rulers of the Kachari kingdom and it was named Hidimba, and the kings as Hidimbesvar. The name Hiḍimbā continued to be used in the official records when the East India Company took over the administration of Cachar.