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