與佛陀同時代、被視為外道的六師之一，是一個強調身心極度自律、以苦行洗淨罪業的教派領袖，自稱擁有不間斷的全知全見，主張唯有耗盡宿業方能滅盡諸苦。

One of six teachers contemporary with the Buddha regarded as heretical, leader of an ascetic movement emphasizing strict bodily restraint and the washing away of evil through austerity, who claimed unbroken omniscience and taught that suffering ends only once the effects of past deeds are exhausted.