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.[1] The reigning emperor was Go-Fukakusa-tennō (後深草天皇?).[2]
Events of the Kōgen era[change]
- 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.[3]
- 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.[3]
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