Chōgen

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Chōgen (長元) was a Japanese era name (年号, nengō, lit. "year name") after Manju and before Chōryaku. This period spanned the years from July 1028 through April 1037.^[1] The reigning emperors were Go-Ichijō-tennō (後一条天皇) and Go-Suzaku-tennō (後朱雀天皇).^[2]

• 1028 Chōgen gannen (長元元年): The new era name Chōgen was created to mark and event or series of events. The previous era ended and the new one commenced in Manju 5, on the 25th day of the 7th month.^[3]

• Chōgen 9, on the 17th day of the 4th month (1036): In the 9th year of Emperor Go-Ichijō's reign (後一条天皇9年), he died; and the succession (senso) was received by his son.^[4]
• Chōgen 9, in the 7th month (1036): Emperor Go-Suzaku is said to have acceded to the throne (sokui).^[5]

• 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

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