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Kōhō (康保) was a Japanese era name (年号, nengō, "year name") after Ōwa and before Anna. This period spanned the years from July 964 through August 968.^[1] The reigning emperors were Murakami-tennō (村上天皇) and Reizei-tennō (冷泉天皇).^[2]

• February 16, 964 Kōhō gannen (康保元年): The new era name was created to mark an event or series of events. The previous era ended and the new one commenced in Ōwa 4, on the 10th day of the 7th month of 964.^[3]

• 964 (Kōhō 1, 4th month): The Empress Fujiwara no Ansi died. The empress' younger sister married the emperor's older brother, Shigeakira-shinnō; and shortly afterwards, he died. Then his wife also died. In his grief, the emperor neglected his duty to care for the government.^[4]
• 965 (Kōhō 2, 4th month): The udaijin Fujiwara no Akihira died at the age of 68.^[4]
• 965 (Kōhō 2, 12th month): The emperor celebrated his 40th birthday.^[4]
• July 5, 967 (Kōhō 4, 25th of the 5th month): The emperor died at age 42 years, having reigned 21 years in total.^[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 Ōdai 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