The Ganga King ruled over Kalinga from the 6th Century to 11th Century A.D. At that time Kalinga was restricted by the river Rusikulya in the north and the Simhachal hills in the south. At the centre of Kalinga was the Mahendragiri range of hills. The Mathar Kings who ruled over Kalinga before the Gangas had Singhapur as their Capital.