The origins of Kalasa are traceable to Mythology. Although unsubstantiated, local myths attribute the origin of Kalasa to an event mentioned found in the Skanda Purana.

Accordingly, the wedding of Lord Shiva and Parvathi in Varanasi caused a shift in the Earth's rotation because of the attendance of all Gods and Goddesses. To restore the Earth's balance, Lord Shiva requested Sage Agasthya to travel South. Agasthya however, expressed his wish to witness the wedding. Lord Shiva assured to grant divine vision to the sage, which would enable him to witness the wedding from any part of the world.

Agasthya travelled southward and resided in Kalasa from where he watched the wedding. Local legends state that a pilgrimage to Kalasa brings greater religious merit (punya) than a visit to Varanasi.