Emperor Toba (鳥羽天皇, Toba Tennō, February 24, 1103 - July 20, 1156) was the 74th emperor of Japan, according to the traditional order of succession.
He reigned nominally from 1107 to 1123, with power in effect being exercised by his grandfather, the retired emperor Shirakawa.
When Shirakawa died in 1129, Toba also became retired emperor. His personal name is prince Munehito (宗仁). His consort is empress Fujiwara no Nariko.
Toba was the son of Emperor Horikawa. He left many children, among them the future emperors Sutoku, Konoe and Go-Shirakawa.
After the death of his mother, Toba was taken in charge and raised by his grandfather the retired emperor Shirakawa.
At the age of four, he is enthroned as emperor upon the death of his father Horikawa, with the affairs of government remaining under the control of his grandfather. The Gukanshō praises the child ruler's character:
"That said, he had the personality (of his uncle) Fujiwara no Kinzane (藤原公実), characterized by the study of Chinese Civilization, and walked in the footsteps of (his ancestor) Sugawara no Michizane, but Toba had more of the Yamato-Damashii (the soul of Japan) than either of them."
In 1123, his grandfather forced him to abdicate in favor of his son Sutoku. Toba was then 21 years old.
After the death of Shirakawa in 1129, Toba became himself a retired emperor, exercising power through the reign of three successive emperors, Sutoku, Konoe and Go-Shirakawa.
In 1142, Toba became a monk at the temple of Tōdai-ji under the name of Kūkaku and assumed the title of Daijō-Tennō.
In the same year, he forced Sutoku to step down from the throne in favor of Konoe, then only two years old, which would later be one of the causes of the Hōgen rebellion that broke out upon his death in 1156. Toba is buried in Anrakuju-in.