and Muslims alike. Baro-Bhuyan Interregnum Alauddin Hussain Shah's representative in Kamata, his son Shahzada Danyal and his officers, was seized and killed by the Baro-Bhuyans of the region and the region lapsed into their confederated style of governance till the Koches took over. Though it is not known when the Baro-Bhuyan rule began, historians estimate that Biswa Singha's campaign against the Baro-Bhuyans began in about 1509. Koch kingdom Biswa Singha (1515–1540) Nara Narayan (1540–1587) The Kamata kingdom then passed into the hands of the Koch dynasty, with Biswa Singha consolidating his control over the Bara-Bhuyans one after another and establishing the Koch dynasty with its dominion from the Karatoya river in the west to the Barnadi river in the east. In the 1581 Raghudev, the son of Chilarai and the nephew of Nara Narayan, affected a split in the kingdom—Koch Hajo and Koch Bihar. Though Raghudev had accepted the suzerainty of his uncle, the two parts of the original Kamata kingdom split for good in 1587 when Naranarayan died, the boundary between them forming roughly the administrative boundary between the present-day Assam and West Bengal. Koch Hajo, the eastern kingdom, soon came under attack from the Mughal, and the region went back and forth for between the Mughal and the Ahoms, finally settling with the Ahoms. Koch Bihar, the western kingdom, first befriended the Mughals and then the British, and the rulers maintained the princely state till the end of the British rule. Administration system Yuvaraj: Biswa Singha appointed his brother Sisu as the Yuvaraj. The descendant of Sisu became the Raikat kings of Jalpaiguri. Karjis/Karzis: Biswa Singha appointed twelve minister from his tribesman to form a Karjee, this position was hereditary. Two important Karjee and Yuvaraj form a cabinet. Senapati: Commander of a standing army. Paik System Paik: Individual male Thakuria: in charge of over 20 paiks. Saikia: in charge of over 100 paiks. Hazari: in charge of over 1000 paiks. Omra: in charge of over 3000 paiks. Nawab: in charge of over 66,000 paiks. See also Koch–Ahom conflicts Notes References Kingdoms of Assam History of Cooch Behar