Koyasan Shingon sect is one of Shingon sect that was founded in the early Heian Period by Kobo Daishi (a posthumous title of the priest Kukai) who visited China and studied Esoteric Buddhism with Keika (also called Eka) in Qinglongsi Temple (in Xian City) in Changan (Xian City) during the Tang Dynasty (China).
高野山真言宗（こうやさんしんごんしゅう）は、平安時代初頭に弘法大師（空海）が入唐し、唐（中国）・長安（西安市）の青龍寺(西安市)で恵果（けいか・えか）から密教を学び、日本に帰国後、開いた真言宗の一宗派。