Hōgen (era)
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Hōgen (保元) was a Japanese era name (年号, nengō; lit. "year name") after Kyūju and before Heiji. This period spanned the years from April 1156 through April 1159. The reigning emperors were Emperor Go-Shirakawa-tennō (後白河天皇) and Emperor Nijō-tennō (二条天皇).