Kengen(乾元), also known as Kangen or Ken'ei, was a Japanese era(年号,,nengō,, lit. "year name") after Shōan and before Kagen. This period started in November 1302 and ended in August 1303. During this time, the emperor was Go-Nijō-tennō(後二条天皇).
1302 (Kengen 1): The central structure of Shin-Yakushi-ji Buddhist temple complex was repaired during the Kengen Era. It is one of the oldest wooden buildings in Japan. It still has some of its original woodwork from its 8th century construction.
1302 (Kengen 1, 6th month): Emperor Go-Nijō made a formal visit to the retirement home of his grandfather, the former Emperor Kameyama. Late the same night, Kameyama sent a poem to his grandson in the Imperial palace. Emperor Go-Nijō responded with a poem:
♯The Northern pretenders did not recognize the Genkō era. Gentoku was used in the Northern Court until 1332. ₪The Shōkyō era was recognized only by the Northern pretenders, not by the Southern Court. ‡ Upon reunification of the Northern and Southern Courts in 1392, Genchū was discontinued. Meitoku was used until 1394.