The Hoysala rulers were originally from Malenadu, an elevated region in the Western Ghats. In the 12th century, taking advantage of the internecine warfare between the Western Chalukya Empire and Kalachuris of Kalyani, they annexed areas of present-day Karnataka and the fertile areas north of the Kaveri delta in present-day Tamil Nadu. By the 13th century, they governed most of Karnataka, minor parts of Tamil Nadu and parts of western Andhra Pradesh and Telangana in the Deccan Plateau.