|Emperor of Japan|
|Reign||392 BC – 291 BC (traditional)|
|Died||291 BC (aged 136)|
|Burial||Tamate no oka no e no misasagi (Gose)|
|Issue||Prince Ōkibi no Morosusumi|
No firm dates can be assigned to this emperor's life or reign; he is conventionally considered to have reigned from 392 BC through 291 BC.
Modern scholars have come to question the existence of at least the first nine emperors; Suizei's descendant, Emperor Sujin is the first that many agree might have actually existed. The name Kōan-tennō was assigned to him posthumously by later generations.
Kōan is regarded by historians as a "legendary emperor" and there is a paucity of information about him. There is insufficient material available for further verification and study. The reign of Emperor Kinmei (539–571 AD), the 29th emperor, is the first for which contemporary historiography is able to assign verifiable dates; However, the conventionally accepted names and dates of the early emperors were not to be confirmed as "traditional" until the reign of Emperor Kanmu (781–806), the 50th sovereign of the Yamato dynasty.
In the Kojiki and Nihonshoki only his name and genealogy were recorded. He is believed to be son of Emperor Kōshō; and his mother is believed to have been Yosotarashi-no-hime, who was the daughter of Okitsuyoso, and ancestress of the Owari. The Japanese have traditionally accepted this sovereign's historical existence, and an Imperial misasagi or tomb for Kōan is currently maintained; however, no extant contemporary records have been discovered that confirm a view that this historical figure actually reigned. He is considered to have been the fifth of eight emperors without specific legends associated with them, also known as the "eight undocumented monarchs" (欠史八代, Kesshi-hachidai).
Kōan is a posthumous name. It is undisputed that this identification is Chinese in form and Buddhist in implication, which suggests that the name must have been regularized centuries after the lifetime ascribed to Kōan, possibly during the time in which legends about the origins of the Yamato dynasty were compiled as the chronicles known today as the Kojiki.
The actual site of Kōan's grave is not known. This emperor is traditionally venerated at a memorial Shinto shrine (misasagi) in Tamade, Gose. The Imperial Household Agency designates this location as Kōan's mausoleum. It is formally named Tamate no oka no e no misasagi.
Consorts and children
Empress: Oshihime (押媛), daughter of Amatarashikunioshihito (天足彦国押人命)
- Prince Ōkibi no Morosusumi (大吉備諸進命)
- Prince Ōyamatonekohikofutoni (大日本根子彦太瓊尊) Emperor Kōrei
- "Genealogy of the Emperors of Japan" at Kunaicho.go.jp; retrieved 2013-8-28.
- Imperial Household Agency (Kunaichō): 孝安天皇 (6); retrieved 2013-8-22.
- Titsingh, Isaac. (1834). Annales des empereurs du japon, p. 5, p. 5, at Google Books; Brown, Delmer M. (1979). Gukanshō, p.252; Varley, H. Paul. (1980). Jinnō Shōtōki, p. 90;
- Ponsonby-Fane, Richard. (1959). The Imperial House of Japan, p. 30.
- Yoshida, Reiji. "Life in the Cloudy Imperial Fishbowl", Japan Times. March 27, 2007; retrieved 2013-8-22.
- Brinkley, Frank. (1915). A History of the Japanese People from the Earliest Times to the end of the Meiji Era, p. 21, p. 21, at Google Books; excerpt, "Posthumous names for the earthly Mikados were invented in the reign of Emperor Kanmu (782–805), i.e., after the date of the compilation of the Records and the Chronicles.
- Kelly, Charles F. "Kofun Culture", Japanese Archaeology. April 27, 2009.
- Titsingh, pp. 34–36; Brown, pp. 261–262; Varley, pp. 123–124.
- Hoye, Timothy. (1999). Japanese Politics: Fixed and Floating Worlds, p. 78; excerpt, "According to legend, the first Japanese emperor was Jinmu. Along with the next 13 emperors, Jinmu is not considered an actual, historical figure. Historically verifiable Emperors of Japan date from the early sixth century with Kinmei.
- Aston, William. (1896). Nihongi, pp. 109.
- Varley, p. 90.
- Aston, pp. 145–146.
- Brown, p. 252; Varley, p. 90.
- Ponsonby-Fane, p. 418.
- Aston, William George. (1896). Nihongi: Chronicles of Japan from the Earliest Times to A.D. 697. London: Kegan Paul, Trench, Trubner. OCLC 448337491
- 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
- Chamberlain, Basil Hall. (1920). The Kojiki. Read before the Asiatic Society of Japan on April 12, May 10, and June 21, 1882; reprinted, May, 1919. OCLC 1882339
- Nussbaum, Louis-Frédéric and Käthe Roth. (2005). Japan encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5; OCLC 58053128
- Ponsonby-Fane, Richard Arthur Brabazon. (1959). The Imperial House of Japan. Kyoto: Ponsonby Memorial Society. OCLC 194887
- 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). Jinnō Shōtōki: A Chronicle of Gods and Sovereigns. New York: Columbia University Press. ISBN 978-0-231-04940-5; OCLC 59145842
| Legendary Emperor of Japan
392 BC – 291 BC