810 (Kōnin 1): Prince Ōtomo was named the heir of Emperor Saga at 25 years of age.
30 May 823 (Kōnin 14, 17th day of the 4th month): In the 14th year of Emperor Saga's reign, the monarch abdicated. The succession (senso) was received by Prince Ōtomo, who was Saga's younger brother. Soon afterwards, the prince is said to have said to have acceded to the throne (sokui). This was confirmed in ceremonies.
22 March 833 (Tenchō 10, 28th day of the 2nd month): In the 10th year of Emperor Junna's reign, he abdicated; and the succession (senso) was received by a his adopted son, who would be known as Emperor Ninmyō.
11 June 840 (Jōwa 7, 8th day of the 5th month): Former-Emperor Junna died at the age of 55.
↑Ponsonby-Fane, Richard. (1959). The Imperial House of Japan, p. 64.
↑Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 102-106; Brown, Delmer M. et al. (1979). Gukanshō, pp. 282-283; Varley, H. Paul. (1980). Jinnō Shōtōki, p. 164;