Emperor Go-Toba
In 1221 CE, because of the Jōkyū Incident, an unsuccessful attempt by Emperor Go-Toba to seize real power, the Kamakura shogunate completely excluded those of the imperial family descended from Emperor Go-Toba from the Chrysanthemum throne, thus forcing Emperor Chūkyō to abdicate. After the Genpei War, he, as the grandson of the late Emperor Takakura, who was also a nephew of the then-exiled Retired Emperor Go-Toba, and Chūkyō's first cousin, was enthroned as Go-Horikawa. He ruled from July 29, 1221 CE to October 26 (?), 1232 CE.