The son of a brahmin of Nālakagāma, a friend of Sāriputta before the latter left the world. Later, Sunāga heard the Buddha preach, entered the Order, and attained arahantship.
In the time of Sikhī Buddha, thirty one kappas ago, he was a brahnnin versed in the Vedas, and lived in a forest hut near Mount Vasabha as teacher of three thousand pupils. One day he met Sikhī Buddha, and, knowing by the signs on his body that he was a Buddha of infinite wisdom, he was suffused with joy, as a result of which he was born after death in the deva world. Twenty seven kappas ago he was a king named Siridhara (Thag.vs.85; ThagA.i.182).
He is evidently identical with Rahosaññaka of the Apadāna. Ap.i.166f.