Tenchō

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What Wikipedia says

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).

Excerpt from the Wikipedia article “Tenchō”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ignis, CC BY-SA 3.0, via Wikimedia Commons.