Kengen (乾元) was a Japanese era name (年号, nengō, lit. "year name") after Shōan and before Kagen. This period spanned the years from November 1302 through August 1303.[1] The reigning emperor was Go-Nijō-tennō (後二条天皇).[2]
1302Kengen gannen (乾元元年): 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 Shōan 4. The era name is derived from the I Ching and combines the characters 乾 ("heaven" in the Bagua) and 元 ("foundation").