Tenkai

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Buddhism in Japan
Schools Jōjitsu Hosso Sanron Kegon Ritsu Kusha Tendai Shingon Jōdo-shū Jōdo Shinshū Rinzai Sōtō Nichiren Ōbaku Fuke-shū Shugendo Japanese new religions Zen in the US
Key figures Shōtoku Tori Busshi Rōben Saichō Kūkai Jōchō Kūya En no Gyōja Hōnen Myōe Shinran Jōkei Eison Ninshō Dōgen Eisai Ingen Nichiren Unkei Enni Issan Ichinei Musō Soseki Sen no Rikyū Rennyo Sesshū Tōyō Takuan Sōhō Ingen Hasegawa Tōhaku Sakuden Tenkai Inoue Enryō Murakami Senshō Nishida Kitarō Shaku Sōen D. T. Suzuki Suzuki Shunryū
Key topics Nihon Shoki Art Deities Architecture Temples Hongaku Honji suijaku Shinbutsu-shūgō Gongen Nenbutsu Death poem Zen garden Zazen Daimoku Sōhei Ikkō-ikki Butsudan Obon Kaichō Kanjin Senjafuda Danka system Shinbutsu bunri Haibutsu kishaku Gozan Bungaku
Glossary of Japanese Buddhism
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Tenkai (Japanese: 天海, 1536–13 November 1643) was a Japanese Tendai Buddhist monk of the Azuchi-Momoyama and early Edo periods. He achieved the rank of Daisōjō, the highest rank of the priesthood. His Buddhist name was first Zuifū (随風), which he changed to Tenkai in 1590. Also known as Nankōbō Tenkai (南光坊 天海), he died on 13 November 1643, and was granted the posthumous title of Jigen Daishi (慈眼大師) in 1648.

Tenkai was at Kita-in (then written 北院) in Kawagoe in 1588, and became abbot in 1599. He was on the advisor of Tokugawa Ieyasu, and served as a liaison between the Tokugawa Shogunate and the Imperial Court in Kyoto. One of his projects was the rebuilding of Enryaku-ji, which had been devastated by Oda Nobunaga. He also revitalized Kita-in, and changed the characters of its name to 喜多院. Nearing death in 1616, Ieyasu entrusted Tenkai with his last will regarding matters of his funeral and his posthumous name. Tenkai selected gongen rather than myōjin, and after death Ieyasu became known as Tōshō Daigongen.

Tenkai continued to serve as a consultant to the next two Tokugawa shōguns. In 1624, retired shōgun Tokugawa Hidetada and ruling shōgun Tokugawa Iemitsu asked him to establish Kan'ei-ji, a Buddhist temple to the northeast of Edo Castle in Ueno.

There are several theories concerning his early life. Some fiction writers postulate that he was in actuality Akechi Mitsuhide. It is not certain whether Mitsuhide died at the Battle of Yamazaki or not, and some suppose that he survived and began a new life as the priest Tenkai.^{[citation needed]}