Kūkai, Japanese Buddhist monk, founder of Esoteric (Shingon) Buddhism (born 774)

Kūkai , born Saeki no Mao posthumously called Kōbō Daishi , was a Japanese Buddhist monk, calligrapher, and poet who founded the esoteric Shingon school of Buddhism. He travelled to China, where he studied Tangmi under the monk Huiguo. Upon returning to Japan, he founded Shingon—the Japanese branch of Vajrayana Buddhism. With the blessing of several Emperors, Kūkai was able to preach Shingon teachings and found Shingon temples. Like other influential monks, Kūkai oversaw public works and constructions. Mount Kōya was chosen by him as a holy site, and he spent his later years there until his death in 835 C.E.

Shingon is one of the major schools of Buddhism in Japan and one of the few surviving Vajrayana lineages in East Asian Buddhism. It is a form of Japanese Esoteric Buddhism and is sometimes called "Tōmitsu". The word shingon is the Japanese reading of the Chinese word 真言, which is the translation of the Sanskrit word mantra.

April 22 is the 112th day of the year in the Gregorian calendar; 253 days remain until the end of the year.