on banks of Tunga river, Shri Adi Sankara saw a cobra with a raised hood, providing shelter from the hot sun, to a frog about to spawn.
He came to know that the place was so blessed as Rishya Sringa Rishi was doing penance
Rishyasringa was the sage who officiated Putra Kameshti Yagna of King Dasaratha, which got Lord Rama to earth. The sage has brought rains to the drought hit region of Karnataka with his grace and has blessed many. Finally Lord Shiva gave him Mukthi In the form of Lightning
Jagadguru Adi Sankara established a mutt here, which came to be known as Sringeri mutt