Saicho (??, September 15, 767 – June 26, 822) was a Japanese Buddhist monk credited with founding the Tendai school of Buddhism based on the Chinese Tiantai school he was exposed to during his trip to Tang China beginning in 804.
He founded the temple and headquarters of Tendai at Enryaku-ji on Mount Hiei near Kyoto.
He is also said to have been the first to bring tea to Japan.
After his death, he was awarded the posthumous title of Dengyo Daishi (????).