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Kengen ( was a 乾元) Japanese era name ( after 年号, , lit. "year name") nengō, and before Shōan This period spanned the years from November 1302 through August 1303. Kagen. The reigning emperor was  Go-Nijō -tennō (. 後二条天皇)
Change of era
1302 Kengen gannen (: The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced in 乾元元年) Shōan 4.
Events of the Kengen era
1302 ( Kengen 1, 16th day of the 6th month):Emperor Go-Nijo visited the home of retired Emperor Kameyama.  1302 ( Kengen 1): Major repairs and reconstruction at Yakushi-ji. 
^ Nussbaum, Louis-Frédéric. (2005). "
Kengen" in Japan Encyclopedia, p. 508, at , p. 508 Google Books; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File Archived 2012-05-24 at Archive.today.
^ Titsingh, Isaac. (1834).
Annales des empereurs du japon, p. 275-278; Varley, H. Paul. (1980). Jinnō Shōtōki. p. 239.
^ Perkins, George W. (1998).
The Clear Mirror: a Chronicle of the Japanese Court During the Kamakura period (1185-1333),, p. 150., at p. 150. Google Books
^ Pier, Garrett Chatfield. (1914).
Temple treasures of Japan,, p. 95, at p. 95. Google Books