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Eiso (永祚) was a Japanese era name (年号, nengō, lit. "year name") after Eien and before Shōryaku. This period spanned the years from August 988 through November 990.^[1] The reigning emperor was Ichijō-tennō (一条天皇).^[2]

• 989 Eiso 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 in Eien 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 retired Emperor En'yū, who is now known as Kongō 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