Kōnin (era)Kōnin was a Japanese [era name] after Daidō and before Tenchō. This period spanned the years from September 810 through January 824. The reigning emperors were Emperor Saga and Emperor Junna.Change of eraFebruary 9, 810 Kōnin gannen: 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.Events of the ''Kōnin'' eraMay 30, 823 : In the 14th year of Emperor Saga's reign, he abdicated; and the succession was received by his younger brother, Emperor Kammu's third son. Shortly thereafter, Emperor Junna is said to have acceded to the throne..