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Eiso (永祚) was aJapanese era name (年号,nengō; lit. "year name") afterEien and beforeShōryaku. This period spanned the years from August 988 through November 990.^[1] The reigning emperor wasIchijō-tennō (一条天皇).^[2]

• 989Eiso gannen (永祚元年): The new era name was created to mark an event or a number of events. The previous era ended and a new one commenced inEien 2, on the 8th day of the 8th month of 989.^[3]

• 989 (Eiso 1, 1st month): Emperor Ichijō made a personal visit to the home of his father, the retiredEmperor En'yū, who is now known asKongō Hō.^[4]
• 989 (Eiso 1, 5th month):Fujiwara no Kaneie fell ill, and his son,Fujiwara no Michitaka, was chosen as regent (Kampaku) in his place. Kaneie retired from public life. He shaved his head and became a Buddhist monk.^[4]
• July 26, 989 (Eiso 2, 2nd day of the 7th month): Fujiwara no Kaneie died at age 62, and his home was converted into a Buddhist temple.^[4]

• 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

• Japanese eras
• 980s in Japan
• 990s in Japan
• 990
• 10th-century neologisms

• Articles with short description
• Short description is different from Wikidata
• Articles containing Japanese-language text