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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).
February 20, 978Tengen 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.