Seiryu Gongen isn't described in Kyoki (sutra), but according to Kukai's Goyuigo (written will) it was Zennyo Ryuo, (Dragon King Zennyo) the third (also said to be fourth) daughter of Shakara (Sakara, Shagara), one of the Hachidai Ryuo (the eight dragon kings of Indian myth), and lived in Munetsuchi (無熱池) (a legendary pond that is said to be located in the Himalayas).
清瀧権現は経軌には説かれておらず、空海の御遺告によると、インド神話に登場する八大竜王の一、沙掲羅（しゃから、シャガーラ）の第三王女（一説には第四王女とも伝えられる）である善女（善如）龍王で、無熱地に住していた。