Chōgen
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Chōgen (長元) was a Japanese era name (年号, nengō; lit. "year name") after Manju and before Chōryaku. This period spanned the years from July 1028 through April 1037. The reigning emperors were Go-Ichijō-tennō (後一条天皇) and Go-Suzaku-tennō (後朱雀天皇).