[1][2] The Bainuk people were likely formed by a combination of the first inhabitants of the Casamance region with newcomers from the Tenda areas to the east.
[3] They established numerous kingdoms between the Cacheu river and the Gambia, which eventually federated into Kasa.
[4] In the 15th century, Portuguese slave traders and navigators established a trading station in the area.
[7] Kasanga, along with the Bainuk, were major importers of cotton from Cape Verde for their domestic cloth industry.
Much of Kasa's territory was seized by the Bainuk and the Mandinka kingdoms of Birassu and Kiang, including the major port of Tendaba.