Jōgen (貞元) was a Japanese era (年号,,nengō,, lit. "year name") after Ten'en and before Tengen. This period spanned the years from July 976 through November 978. The reigning emperor was En'yū-tennō (円融天皇).
February 3, 976Jōgen gannen (貞元元年): 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 Ten'en 4, on the 13th day of the 7th month of 976.
Events of the Jōgen era
June 11, 976 (Jōgen 1, 11th day of the 5th month): The Imperial Palace was destroyed by a great fire.