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Tengen (天元) was a Japanese era (年号,, nengō,, lit. "year name") after Jōgen and before Eikan. This period started in November 978 and ended in April 983.[1] The reigning emperor was En'yu-tennō (円融天皇).[2]
- ↑ Nussbaum, Louis-Frédéric. (2005). "Tengen" in Japan Encyclopedia, p. 958.
- ↑ Titsingh, Isaac. (1834). Annales des empereurs du japon, pp. 144-148; Brown, Delmer et al. (1979). Gukanshō, p. 299-300; Varely, H. Paul. (1980). Jinnō Shōtōki, pp. 191-192.