The Koch dynasty (Pron: kɒʧ; 1515–1949) ruled parts of eastern Indian subcontinent in present-day Assam and Bengal. Biswa Singha established power in the erstwhile Kamata Kingdom which had emerged from the decaying Kamarupa Kingdom. The dynasty came to power by removing the Baro-Bhuyans, who had earlier removed the short-lived rule established by Alauddin Hussain Shah.
The dynasty split into three among the descendants of Biswa Singha's three sons; two antagonistic branches Koch Bihar and Koch Hajo and a third branch at Khaspur. Koch Bihar aligned with the Mughals and the Koch Hajo branch broke up into various sub-branches under the Ahom kingdom. Koch Bihar became a princely state during British rule and was absorbed after Indian independence. The third branch at Khaspur disappeared into the Kachari kingdom. Raikat is a collateral branch of the Koch dynasty that claim descent from the Sisya Singha, the brother of Biswa Singha.
The name Koch denotes a matrilineal ethnic group to which Biswa Singha's mother belonged; and the king as well as most of the population of the kingdom (Koch Bihar) belonged to the Koch community.
Kamata Kingdom
After the fall of the Pala dynasty of Kamarupa, the kingdom fractured into different domains in the 12th century. Sandhya, a ruler of Kamarupanagara (present-day North Guwahati) moved his capital further west to present-day North Bengal in the middle of the 13th century and the domain he ruled over came to be called Kamata kingdom. The buffer region, between the eastern kingdoms and Kamata was the domain of the Baro-Bhuyans chieftains. Alauddin Husain Shah of Gaur removed Nilambar of the Khen dynasty in 1498, occupied Kamata and placed his son Danyal Husayn in charge. Within a few years the Baro-Bhuyans—led by one Harup Narayan of the Brahmaputra valley—defeated, captured, and executed Daniyal, and the region lapsed into Bhuyan confederate rule.
It was in this context that a number of independent Koch tribes were united under a leader named Hajo, who occupied Rangpur and Kamrup.
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Le district de Cooch Behar (কোচবিহার জেলা) est un district de l’État indien du Bengale-Occidental. Le district a une population de habitants en 2011 pour une superficie de . Jusqu'en août 2015, le district possédait 103 enclaves en territoire bangladais. Par ailleurs, un total de 92 enclaves bangladaises se trouvaient en territoire indien, particulièrement dans le district de Cooch Behar.
File:Major kingdoms of Assam.png|thumb|upright=1.3|Major kingdoms of Assam{{sfn|Baruah|1986}} rect 50 50 650 120 [[Kamarupa|Kamarupa Kingdom]] rect 45 240 160 310 [[Kamata Kingdom]] rect 165 240 300 310 [[Baro-Bhuyan|Bhuyan chieftains]] rect 305 240 415 310 [[Ahom Kingdom]] rect 425 240 540 310 [[Chutiya Kingdom]] rect 550 240 660 310 [[Kachari Kingdom]] rect 4 425 80 495 [[Cooch Behar State|Koch Bihar]] rect 120 425 190 495 [[Koch Hajo]] rect 125 660 640 760 [[Colonial Assam|History of Assam]] The history of Assam is the history of a confluence of people from the east, west, south and the north; the confluence of the Austroasiatic, Tibeto-Burman (Sino-Tibetan), Tai and Indo-Aryan cultures.
The Kamata Kingdom (pron: ˈkʌmətɑ) emerged in western Kamarupa probably when Sandhya, a ruler of Kamarupanagara, moved his capital west to Kamatapur sometime after 1257 CE. Since it originated in the old seat of the Kamarupa kingdom, and since it covered most of the western parts of it, the kingdom is also sometimes called as Kamarupa-Kamata. It covered a region corresponding to present-day undivided districts of Kamrup, Goalpara, Jalpaiguri, and Cooch Behar district in India and Rangpur and northern parts of Mymensingh in Bangladesh.