From the 6th century to the 9th century CE, the Chalukyas of Badami or Rashtrakutas of the Deccan, the Pallavas of Kanchi, and Pandyas of Madurai dominated the politics of south India. The Pandyas at one time or another ruled or invaded the fertile estuary of Kaveri (the Chola country), the ancient Chera country (Kongu and central Kerala) and Venadu (south Kerala), the Pallava country and Sri Lanka. The Pandyas went into decline with the rise of the Cholas of Tanjore in the 9th century and were in constant conflict with them. The Pandyas allied themselves with the Sinhalese (Sri Lanka) and the Cheras in harassing the Chola Empire until it found an opportunity for reviving its fortunes during the late 13th century.