It was said that Ryuju Bosatsu had been given Mikkyo sutras from Kongosatta, an immediate pupil of Dainichinyorai, and thus conveyed them in this world.
龍樹菩薩　：　大日如来の直弟子金剛薩埵（こんごうさった）から密教経典を授かって、世に伝えたといわれている。