Kōgen

was a  after Kenchō and before Shōka.  This period started in October 1256 and ended in March 1257.Nussbaum, Louis-Frédéric. (2005).  "Kōgen" in Japan encyclopedia, p. 542. The reigning emperor was .Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 248-253; Varley, H. Paul. (1980). Jinnō Shōtōki. p. 231-232.

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.Titsingh,  p. 252.
 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.

Related pages 
 Kamakura period

References

Other websites
 National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection

Kōgen1st2nd  1256  1257 
Preceded by:KenchōEra or nengō:'Kōgen
| width =20% |Succeeded by:Shōka''

Category:Japanese eras
Category:1256
Category:1257
Category:1250s in Japan