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Bunka (文化, culture) was a Japanese era name (年号, nengō, lit. 'year name') after Kyōwa and before Bunsei . The period spanned the years from January 1804 to April 1818. [1] The reigning emperors were Kōkaku -tennō (光格天皇) and Ninkō -Tennō (仁孝天皇).