Because there was no one to succeed the Imperial Throne from Emperor Go-Takakura's line, Emperor Go-Saga (Prince Tsuchimikado) was enthroned in July 1242; and the suffix -in used in posthumous Buddhist names was changed to Go-Toba-in.
後高倉皇統の断絶によって後嵯峨天皇（土御門院皇子）の即位となった仁治3年（1242年）7月、院号が後鳥羽院に改められた。