Taira clan
The Taira (平) clan was one of the four most important clans that dominated Japanese politics during the Heian, Kamakura and Muromachi periods of Japanese history. The other clans were the Minamoto, the Fujiwara, and the Tachibana. The clan is divided into four major groups, named after the emperors they descended from: Kanmu, Ninmyō, Montoku, and Kōkō.