was a Japanese era or nengō which was promulgated by the more militarily powerful of two Imperial rival courts during the . This nengō came after Kōei and before Kannō and lasted from October 1345 through February 1350.[1] The emperor in Kyoto was .[2] Go-Kōgon's Southern Court rival in Yoshino during this time-frame was .
During the Meiji period, an Imperial decree dated March 3, 1911, established that the legitimate reigning monarchs of this period were the direct descendants of Emperor Go-Daigo through Emperor Go-Murakami, whose had been established in exile in Yoshino, near Nara.[3]
Until the end of the Edo period, the militarily superior pretender-Emperors supported by the Ashikaga shogunate had been mistakenly incorporated in Imperial chronologies despite the undisputed fact that the Imperial Regalia were not in their possession.[3]
This illegitimate had been established in Kyoto by Ashikaga Takauji.[3]
In this time frame, Kōkoku (1340-1346) and Shōhei (1346-1370) were Southern Court equivalent nengō.