Explanation:

Cooch Behar district is a district of the state of West Bengal, India, as well as the district's namesake town. During the British Raj, the town of Cooch Behar was the seat of a princely state of Koch Bihar, ruled by the Koch dynasty.

Cooch Behar formed part of the Kamarupa Kingdom of Assam from the 4th to the 12th centuries. In the 12th century, the area became a part of the Kamata Kingdom, first ruled by the Khen dynasty from their capital at Kamatapur. The Khens were an indigenous tribe, and they ruled till about 1498 CE, when they fell to Alauddin Hussain Shah, the independent Pathan Sultan of Gour.