Jōgan

Rarity: Common

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History and politics

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What Wikipedia says

Jōgan (貞観) was a Japanese era name (年号, nengō; "year name") after Ten'an and before Gangyō. This period spanned the years from April 859 through April 878. The two reigning emperors were Seiwa-tennō (清和天皇) and Yōzei-tennō (陽成天皇).

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