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Kōgen (康元) was a Japanese era name (年号, nengō, , lit. "year name") after Kenchō and before Shōka. This period started in October 1256 and ended in March 1257. The reigning emperor was Go-Fukakusa-tennō (後深草天皇).
Events of the Kōgen era
- 1 September 1256 (Kōgen 1, 11th day of the 8th month): Kujō Yoritsune, also known as Fujiwara Yoritsune, died at the age of 39 years.
- 14 October 1256 (Kōgen 1, 24th day of the 9th month): Yoritsune's son and successor as Kamakura shogun, Kujō Yoritsugu, also known as Fujiwara Yoritsugu, died at the age of 18 years.
- National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection
|Era or nengō: