Chōtoku
Chōtoku (長徳) was a Japanese era name (年号,, nengō,, lit. "year name") after Eiso and before Chōhō. This period spanned the years from February 995  through January 999. The reigning emperor was Ichijō-tennō (一条天皇).
Chōtoku (長徳) was a Japanese era name (年号,, nengō,, lit. "year name") after Eiso and before Chōhō.  This period spanned the years from February 995  through January 999. The reigning emperor was Ichijō-tennō (一条天皇).

Change of era
995 Chōtoku gannen (長徳元年): 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 Shōryaku 6, on 22 February 995.

Events of the Chōtoku era
995 (Chōtoku 1): Fujiwara no Michinaga is given the office of Udaijin.
996 (Chōtoku 2, 7th month): Michinaga become Sadaijin; and Fujiwara no Akimitsu is named Udaijin.

Notes
References
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 Odai 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

External links
National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection