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Eien (永延) was a Japanese era (年号, nengō, lit. "year name") after Kanna and before Eiso. This period spanned the years from April 987 through August 988.^[1] The reigning emperor was Ichijō-tennō (一条天皇).^[2]

• January 2, 987 Eien gannen (永延元年): 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 Kanna 3, on the 5th day of the 4th month in the year 987.^[3]

• 987 (Eien 1, 10th month): The emperor paid a visit to the home of Fujiwara no Kaneie.^[4]
• 987 (Eien 1, 11th month): The emperor visited Iwashimizu Hachiman-gū.^[4]
• 987 (Eien 1, 12th month): The emperor visited the Kamo Shrine.^[4]
• 988 (Eien 2, 8th month): Fujiwara no Kaneie invited a number of courtiers to his home where he entertained them in a grand manner.^[4]
• 988 (Eien 2, 11th month): The emperor visited the home of Kaneie to join him in celebrating the courtier's 60th birthday.^[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