A group of Buddhists of the Devadatta school regarded as heretical had known that they had not recognized Shakyamuni as Buddha and, instead, worshipped Kengo no San-butsu (the last three Buddhas of one thousand Buddhas who appeared during the period before Shakya-muni's generation.)
また異端とされる提婆達多派の仏教集団は釈迦を仏と認めず、それ以前に出現した賢劫の三仏を信仰の対象としていたことでも知られる。