Navagupta

During his Digvijaya, passing through many places and propagating his philosophy, Shankara came to Kamarupa. There he defeated Navagupta, a follower of the Shakta school who wrote a commentary on the Vyasa Sutras. Being defeated, Navagupta resorted to black magic and inflicted a disease (rectal fistula) on Shankara. The disease was incurable and the attempts of the disciples to get it treated by physicians were of no avail. Incidentally Padmapada came to know that the desease was inflicted by black magic. He countered the magic with mantra which transferred the disease to Navagupta thus curing Shankara.