According to the Sangam classic "Purananuru", the Chera king Senkuttuvan conquered the lands between Kanyakumari and the Himalayas. Lacking worthy enemies, he besieged the sea by throwing his spear into it. According to the 17th-century Malayalam work "Keralolpathi", the lands of Kerala were recovered from the sea by the axe-wielding warrior sage Parasurama, the sixth avatar of Vishnu (hence, Kerala is also called "Parasurama Kshetram" 'The Land of Parasurama'). Parasurama threw his axe across the sea, and the water receded as far as it reached. According to legend, this new area of land extended from Gokarna to Kanyakumari. The land which rose from sea was filled with salt and unsuitable for habitation; so Parasurama invoked the Snake King Vasuki, who spat holy poison and converted the soil into fertile lush green land. Out of respect, Vasuki and all snakes were appointed as protectors and guardians of the land. P. T. Srinivasa Iyengar theorised, that Senguttuvan may have been inspired by the Parasurama legend, which was brought by early Aryan settlers.