was a after Chōtoku and before Kankō. This period spanned the years from January 999 through July 1004.Nussbaum, Louis-Frédéric. (2005). "Chōhō" in ; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see . The reigning emperor was .Titsingh, Isaac. (1834). Annales des empereurs du japon, pp. 150-154; Brown, Delmer et al. (1979). Gukanshō, p. 302-307; Varely, H. Paul. (1980). Jinnō Shōtōki, pp. 192-195.
Change of era 999 : 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 Chōtoku 5, on the 13th day of the 1st month of 999.Brown, p. 328.
Events of the Chōhō era 999 (Chōhō 1, 11th month: A daughter of Fujiwara no Michinaga is accepted into the Imperial household as Emperor Ichijō's second empress consort. Aikio, better known as Fujiwara no Shōshi (988–1074), is given the title of Chūgū.Titsingh, p. 153. 1001 (Chōhō 3, 11th month): The Imperial palace was destroyed by fire. 1001 (Chōhō 3, 12th month): The widow of Emperor En'yū and the mother of Emperor Ichijō died. She was formerly known as Fujiwara no Senshi.
Notes
References Brown, Delmer M. and Ichirō Ishida, eds. (1979). Gukanshō: The Future and the Past. Berkeley: University of California Press. ; OCLC 251325323 Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ; 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. ; OCLC 6042764
External links National Diet Library, "The Japanese Calendar" -- historical overview plus illustrative images from library's collection