Tenchō
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Tenchō (天長) was a Japanese era name (年号, nengō; lit. "year name") after Kōnin and before Jōwa. This period spanned the years from January 824 through January 834. The reigning emperors were Junna-tennō (淳和天皇) and Ninmyō-tennō (仁明天皇).