Kūkai

, born posthumously called , was a Japanese Buddhist monk, calligrapher, and poet who founded the esoteric Shingon school of Buddhism. He travelled to China, where he studied Tangmi (Chinese Vajrayana Buddhism) 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 CE.

Because of his importance in Japanese Buddhism, Kūkai is associated with many stories and legends. One such legend attributes the invention of the kana syllabary to Kūkai, with which the Japanese language is written to this day (in combination with kanji), as well as the Iroha poem, which helped to standardise and popularise kana. thumb|Portrait of Amoghavajra, one of the five [[Portraits of Seven Shingon Patriarchs that Kūkai brought back commissioned by Huiguo, painted by Li Zhen (housed at Tō-ji), [NT]]] Shingon followers usually refer to Kūkai by the honorific title of , and the religious name of .