His descendants became independent towards the end of the 11th century, and fought with their neighbours to consolidate their rule, including the Eastern Gangas.

Several inscriptions and coins of the Ratnapura branch have been found, but these do not provide enough information to reconstruct the political history of the region with complete certainty.

[4] Kalinga-raja conquered the Dakshina Kosala region from the Somavamshi dynasty, and established the Ratnapura kingdom around 1000 CE.

In 1114 CE, Jajalla-deva I invaded the Chindaka Naga territory to the south, annexing southern parts of Kosala which were under Telugu Choda governorship.

[6] The next ruler, Ratnadeva II, officially declared independence from the Kalachuris of Tripuri[7] and repulsed an invasion by Anantavarman Chodaganga, the king of the Eastern Ganga dynasty.

[4] The Eastern Gangas and the Kalachuris appear to have involved in a long conflict for the control of the Trikalinga and Kosala regions.

[10][better source needed] No information is available about Pratapamalla's successors, except a vague reference in Hemadri's Vrata-khanda which suggests that a king named Jajalla may have succeeded Pratapa-malla.

Varaha appears to have moved his capital from Ratnapura to Kosanga (Kosgain), and fought against the Pathanas (Afghans), whose identity is not clear.

[13] The Ratnapura Kalachuri kingdom was located east of the main routes between northern and southern India, and thus was unaffected by the Muslim invasions of the 13th-16th centuries.

The kingdom enjoyed 700 years of peaceful existence due to its borders being protected by precipitous mountain ranges on almost all sides.

According to a popular theory, the old Kalachuri kingdom consisted of thirty-six garhs or feudal territories, and hence, the region of Chhattisgarh was named after the number of forts it had.

[22] The Kalachuri rulers of Ratnapura issued gold, silver and copper coins, which bear the issuer's name in Nagari script.