For two and a half centuries from the mid 13th, the politics in the Northern India was dominated by the Delhi Sultanate and in the Southern India by the Vijayanagar Empire which originated as a political heir of the erstwhile Hoysala Empire and Pandyan Empire. However, there were other regional powers present as well. In the North, the Rajputs were a dominant force in the Western and Central India. Their power reached to the zenith under Rana Sanga during whose time Rajput armies were constantly victorious against the Sultanate army. In the South, the Bahmani Sultanate was the chief rival of the Vijaynagara and gave Vijayanagara tough days many a times. In the early 16th century Krishnadevaraya of the Vijayanagara Empire defeated the last remnant of Bahmani Sultanate power after which the Bahmani Sultanate collapsed. It was established either by a Brahman convert or patronized by a Brahman and form that source it got the name Bahmani. In the early 16th century, it collapsed and got split into five small Deccan sultanates. In the East, the Gajapati Kingdom remained a strong regional power to reckon with, so was the Ahom Kingdom in the North-east for six centuries.