The Koch dynasty of Assam and Bengal, named after the Koch tribe, emerges as the dominant ruling house in the Kamata kingdom in 1515 after the fall of the Khen dynasty in 1498.
The first of the Koch kings, Viswa Singha and then his sons, Nara Narayan as the subsequent king and Chilarai as the general, soon occupy the western portion of the erstwhile Kamarupa Kingdom as well as some regions of south Assam.
The dynasty forks for the first time into two major branches that control Koch Bihar and Koch Hajo.
Koch Bihar becomes a vassal of the Mughals, whereas Koch Hajo comes under Ahom control and is subsequently absorbed.
Koch Bihar becomes a princely state during British rule and is absorbed after Indian independence.
A third branch of this dynasty at Khaspur disappearsinto the Kachari kingdom.
