About Kūkai

Kūkai (空海), also known posthumously as Kōbō-Daishi , 774–835, was a Japanese Buddhist monk, civil servant, scholar, poet, and artist who founded the Esoteric Shingon or "mantra" school of Buddhism. Shingon followers usually refer to him by the honorific title of Odaishisama (お大師様) and the religious name of Henjō-Kongō (遍照金剛).
Big Think