Jōwa (Heian period)
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Jōwa (承和) was a Japanese era name (年号, nengō, "year name") after Tenchō and before Kashō. This period spanned the years from January 834 through July 848. The reigning emperors were Junna-tennō (淳和天皇) and Ninmyō-tennō (仁明天皇).