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Hōgen (保元) was a Japanese era name (年号, nengō, lit. "year name") after Kyūju and before Heiji. This period spanned the years from April 1156 through April 1159.^[1] The reigning emperors were Emperor Go-Shirakawa-tennō (後白河天皇) and Emperor Nijō-tennō (二条天皇).^[2]

• January 24, 1156 Hōgen gannen (保元元年): The new era name was created to mark an event or series of events. The previous era ended and a new one commenced in Kyūju 3, on the 24th day of the 4th month of 1156.^[3]

• July 20, 1156 (Hōgen 1, 2nd day of the 7th month): Cloistered Emperor Toba-in died at age 54.^[4]
• July 28–August 16, 1156 (Hōgen 1, 10th-29th days of the 7th month): The Hōgen Rebellion,^[5] also known as the Hōgen Insurrection or the Hōgen War.
• 1156 (Hōgen 1, 9th month): The naidaijin Fujiwara Saneyoshi was named sadaijin. The dainagon Fujiwara Koremichi became naidaijin. After the war, tranquility was restored throughout the empire; and the emperor himself was in charge of the government. A special building was constructed in Kyoto, where—as in the days of Emperor Go-Sanjo, requests and complaints were received and examined.^[6]
• 1157 (Hōgen 2, 8th month): Sanjō Saneyuki was dismissed from his position as daijō-daijin; and in the same month, the sadaijin Saneyoshi died. The udaijin Fujiwara no Munesuke was made daijō-daijin. The naidaijin Koremichi was made sadaijin. Fujiwara no Moresane, who was the 15-year-old son of son of kampaku Fujiwara no Tadamichi, became udaijin. The dainagon Sanjō Kinori, who was the son of Saneyuki, obtained the position of naidaijin.^[6]
• 1157 (Hōgen 2, 10th month): The foundations are laid for a grand audience hall (dairi) in the palace. There had not been such a structure within the palace compound since the time of Emperor Shirakawa.^[6]
• August 6, 1158 (Hōgen 3, 11th day of the 8th month): In the 3rd year of Go-Shirakawa's reign (後白河天皇25年), the emperor abdicated; and the succession (senso) was received by his eldest son.^[7]
• 1158 (Hōgen 4, 8th month): Emperor Nijō is said to have acceded to the throne (sokui).^[8]

• 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