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Tengen (天元) was a Japanese era (年号 nengō, "year name") after Jōgen and before Eikan. This period spanned the years from November 978 through April 983. The reigning emperor was En'yū-tennō (円融天皇).
Change of era
- February 20, 978 Tengen gannen (天元元年): 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 Jōgen 3, on the 15th day of the 4th month of 976.
Events of the Tengen era
- 978 (Tengen 1, 8th month): The emperor allowed the daughter of Fujiwara no Kaneie to be introduced into his household; and shortly thereafter, they had a son.
- 978 (Tengen 1, 10th month): Fujiwara no Yoritada was elevated to the position of Daijō-daijin; Minamoto no Masanobu was made Sadaijin; and, Fujiwara no Kaneie was made Udaijin.
- Nussbaum, Louis-Frédéric. (2005). "Tengen" in Japan Encyclopedia, p. 958, p. 958, at 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, pp. 144–148; Brown, Delmer et al. (1979). Gukanshō, p. 299–300; Varely, H. Paul. (1980). Jinnō Shōtōki, pp. 191–192.
- Brown, p. 300.
- Titisingh, p. 146.
- Brown, Delmer M. and Ichirō Ishida, eds. (1979). Gukanshō: The Future and the Past. Berkeley: University of California Press. ISBN 978-0-520-03460-0; OCLC 251325323
- Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5; OCLC 58053128
- Titsingh, Isaac. (1834). Nihon Ōdai Ichiran; ou, Annales des empereurs du Japon. Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland. OCLC 5850691
- Varley, H. Paul. (1980). A Chronicle of Gods and Sovereigns: Jinnō Shōtōki of Kitabatake Chikafusa. New York: Columbia University Press. ISBN 9780231049405; OCLC 6042764
- National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection
| Era or nengō