Jōgen (Kamakura period)
1210 (Jōgen 4, 25th day of the 11th month): In the 12th year of Tsuchimikado's reign, the emperor abdicated for no particular reason; and the succession (senso) was received by his younger brother, the second son of the former-Emperor Go-Toba.  Soon after, Emperor Juntoku's role as emperor was confirmed (sokui).