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]