Jōgan
Period of Japanese history (859–878 CE) / From Wikipedia, the free encyclopedia
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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.[1] The two reigning emperors were Seiwa-tennō (清和天皇) and Yōzei-tennō (陽成天皇).[2]