Overview
Kengen (乾元) is the Japanese era name, or nengō, that covered a brief span from November 1302 through August 1303. Era names are sometimes called a year name in English and serve to mark periods in imperial chronology. The reigning sovereign during Kengen was Emperor Go-Nijō. The era lasted less than a full year, which was not unusual when changes were made for political, ceremonial, or auspicious reasons.
Key facts
- Kanji: 乾元
- Start: November 1302
- End: August 1303
- Reigning emperor: Go-Nijō
- Preceded by: Shōan
- Followed by: Kagen
The name Kengen can appear in romanized forms such as Kangen or Ken'ei in older sources; care should be taken not to confuse it with other era names that look or sound similar. Because the period was short, surviving references are concentrated in court chronicles, temple records, and dated documents that use the nengō system to mark years.
In a broader historical setting, Kengen falls within the Kamakura period, when effective political power often lay with the military government in Kamakura while the imperial court in Kyoto continued traditional and ceremonial functions. Changes of era could reflect a range of motives: seeking good omens after disasters, marking significant ceremonies, or following political decisions at court.
For scholars and readers tracing events or documents, Kengen is a useful chronological marker despite its brevity. When consulting historical lists or primary sources, double-check romanizations and adjacent era names to avoid confusion with similarly named periods. Further reference lists and chronological tables provide context for its position between Shōan and Kagen, and discussions of the nengō system explain how such era names were adopted and recorded (nengō, year name).