The political space after the decline of the Pala power in Bengal was occupied by the Senas whose king Vijayasena succeeded in conquering a large part of Pala territory. The Senas were the supporters of orthodox Hinduism. The dynasty traces its origin to the South, to the Western Chalukya Empire of southern India. There is a record of a Western Chalukya invasion during the reign of Someshvara I led by his son Vikramaditya VI who defeated the kings of Gauda and Kamarupa. This invasion of the Kannada ruler brought bodies of his countrymen from Karnataka into Bengal which explains the origin of the Sena Dynasty.