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Tenkai(天海,Tenkai?, 1536 – 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 in 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 staff 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.
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.
Tenkai appears as the main villain in the first Sakura Wars game.
In the game Sengoku Basara 3, the character Tenkai is portrayed as a cryptic monk who speaks in riddles and wields twin scythes. As with the rumor above, Tenkai is actually a re-skinned model of Akechi Mitsuhide, from the game's predecessor.