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Kōnin (弘仁) was a Japanese era name (年号, nengō, lit. "year name") after Daidō and before Tenchō. This period spanned the years from September 810 through January 824.^[1] The reigning emperors were Saga-tennō (嵯峨天皇) and Junna-tennō (淳和天皇).^[2]

• February 9, 810 Kōnin gannen (弘仁元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Daidō 4, on the 27th day of the 9th month of 810.^[3]

• May 30, 823 (Kōnin 14, 17th day of the 4th month): In the 14th year of Emperor Saga's reign (嵯峨天皇14年), he abdicated; and the succession (senso) was received by his younger brother, Emperor Kammu's third son. Shortly thereafter, Emperor Junna is said to have acceded to the throne.(sokui).^[4]

• Brown, Delmer M. and Ichirō Ishida, eds. (1979). Gukanshō: The Future and the Past. Berkeley: University of California Press. ISBN 978-0-520-03460-0; OCLC 251325323
• Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5; OCLC 58053128
• Titsingh, Isaac. (1834). Nihon Odai Ichiran; ou, Annales des empereurs du Japon. Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland. OCLC 5850691
• Varley, H. Paul. (1980). A Chronicle of Gods and Sovereigns: Jinnō Shōtōki of Kitabatake Chikafusa. New York: Columbia University Press. ISBN 9780231049405; OCLC 6042764

• National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection