# Emperor Kōan

Emperor Kōan (孝安天皇, Kōan-tennō), also known as Yamatotarashihikokunioshihito no Mikoto (大倭帯日子国押人命) was the sixth legendary emperor of Japan, according to the traditional order of succession. Very little is known about this Emperor due to a lack of material available for further verification and study. Kōan is known as a "legendary emperor" among historians as his actual existence is disputed. Nothing exists in the Kojiki other than his name and genealogy. Kōan's reign allegedly began in 393 BC, he had one wife and two sons and reigned for more than 100 years until his death in 291 BC at the age of 137. One of his sons then supposedly became the next emperor. Emperor Kōan is traditionally accepted as the final emperor of the Jōmon period, which ended in 300 BC.

## Legendary narrative

In the Kojiki and Nihon Shoki, only his name and genealogy were recorded. 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 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 Kojiki records Kōan was the second son of Emperor Kōshō, and that he ruled from the palace of Akitsushima-no-miya (葛城室之秋津島宮, and in the Nihon Shoki as 室秋津島宮) at Muro in what would come to be known as Yamato Province. Kōan was allegedly an emperor who reigned for more than a hundred years, and lived to the age of 137 (according to the Kojiki). He allegedly had a wife named Yosotarashi-hime, and fathered two children with her. Kōan's reign lasted from 392 BC until his death in 291 BC, one of his sons then took the throne and would later be referred to as Emperor Kōrei.

## Known information

The existence of at least the first nine Emperors is disputed due to insufficient material available for further verification and study. Kōan is thus regarded by historians as a "legendary Emperor", and is considered to have been the fifth of eight Emperors without specific legends associated with them. The name Kōan-tennō was assigned to him posthumously by later generations. His name might have been regularized centuries after the lifetime ascribed to Kōan, possibly during the time in which legends about the origins of the imperial dynasty were compiled as the chronicles known today as the Kojiki. The name "Kōan" is first credited to Japanese scholar and writer Ōmi no Mifune, who allegedly came up with the name sometime in the latter half of the 8th century.
Emperor Kōan's longevity is disputed as the oldest verified humans usually go into the mid to late 110s. While historian John S. Brownlee calls Kōan's alleged age of 137 at the time of his death "too long", he also says that this is not unusual for mythical figures. He ends his narrative by saying that nobody in Japan was bothered by the longevity of the former emperors until the modern era. Regardless of his age, the actual site of Kōan's grave is not known. Kōan is traditionally venerated at a memorial Shinto shrine (misasagi) in Tamade, Gose. The Imperial Household Agency designates this location as Kōan's mausoleum, and its formal name is Tamate no oka no e no misasagi.
The first emperor that historians state might have actually existed is Emperor Sujin, the 10th emperor of Japan. Outside of the Kojiki, the reign of Emperor Kinmei (c. 509 – 571 AD) is the first for which contemporary historiography is able to assign verifiable dates. The conventionally accepted names and dates of the early Emperors were not confirmed as "traditional" though, until the reign of Emperor Kanmu between 737 and 806 AD.

## Consorts and children

* Empress: Oshi-hime [ja] (押媛), Prince Amatarashikunioshihito's [ja] daughter (Emperor Kōshō's son)
** Prince Ōkibi no Morosusumi (大吉備諸進命)
** Prince Ōyamatonekohikofutoni (大日本根子彦太瓊尊), later Emperor Kōrei

## Family tree

vteGenealogy of early Japanese emperors and empresses :
| | | | | | | Nunakawahime | Nunakawahime | Nunakawahime | Nunakawahime | Nunakawahime | Nunakawahime | | | | | Ōkuninushi$^{:278}$ (Ōnamuchi) | Ōkuninushi$^{:278}$ (Ōnamuchi) | Ōkuninushi$^{:278}$ (Ōnamuchi) | Ōkuninushi$^{:278}$ (Ōnamuchi) | Ōkuninushi$^{:278}$ (Ōnamuchi) | Ōkuninushi$^{:278}$ (Ōnamuchi) | | | | | Kamotaketsunumi no Mikoto | Kamotaketsunumi no Mikoto | Kamotaketsunumi no Mikoto | Kamotaketsunumi no Mikoto | Kamotaketsunumi no Mikoto | Kamotaketsunumi no Mikoto | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Kotoshironushi | Kotoshironushi | Kotoshironushi | Kotoshironushi | Kotoshironushi | Kotoshironushi | | | | | | | | | Tamakushi-hime | Tamakushi-hime | Tamakushi-hime | Tamakushi-hime | Tamakushi-hime | Tamakushi-hime | Takeminakata | Takeminakata | Takeminakata | Takeminakata | Takeminakata | Takeminakata | | | Susa Clan | Susa Clan | Susa Clan | Susa Clan | Susa Clan | Susa Clan |
| | | | | $^1$ Jimmu | $^1$ Jimmu | $^1$ Jimmu | $^1$ Jimmu | $^1$ Jimmu | $^1$ Jimmu | | | $^1$Himetataraisuzu-hime | $^1$Himetataraisuzu-hime | $^1$Himetataraisuzu-hime | $^1$Himetataraisuzu-hime | $^1$Himetataraisuzu-hime | $^1$Himetataraisuzu-hime | | | | | | | | | | | | | | | | | | | Kamo no Okimi | Kamo no Okimi | Kamo no Okimi | Kamo no Okimi | Kamo no Okimi | Kamo no Okimi | | | Mirahime [ja] | Mirahime [ja] | Mirahime [ja] | Mirahime [ja] | Mirahime [ja] | Mirahime [ja] | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $^2$ Suizei | $^2$ Suizei | $^2$ Suizei | $^2$ Suizei | $^2$ Suizei | $^2$ Suizei | | | $^2$Isuzuyori-hime | $^2$Isuzuyori-hime | $^2$Isuzuyori-hime | $^2$Isuzuyori-hime | $^2$Isuzuyori-hime | $^2$Isuzuyori-hime | | | Kamuyaimimi | Kamuyaimimi | Kamuyaimimi | Kamuyaimimi | Kamuyaimimi | Kamuyaimimi | | | | | | | | | | | | | | | | |
| | | | | | | | | $^3$ Annei | $^3$ Annei | $^3$ Annei | $^3$ Annei | $^3$ Annei | $^3$ Annei | | | | | | | | | 〔Ō clan〕 | 〔Ō clan〕 | 〔Ō clan〕 | 〔Ō clan〕 | 〔Ō clan〕 | 〔Ō clan〕 | | | 〔Aso clan〕 | 〔Aso clan〕 | 〔Aso clan〕 | 〔Aso clan〕 | 〔Aso clan〕 | 〔Aso clan〕 | | | | | $^3$ Nunasokonakatsu-hime | $^3$ Nunasokonakatsu-hime | $^3$ Nunasokonakatsu-hime | $^3$ Nunasokonakatsu-hime | $^3$ Nunasokonakatsu-hime | $^3$ Nunasokonakatsu-hime | | | Kamo clan | Kamo clan | Kamo clan | Kamo clan | Kamo clan | Kamo clan | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Takakuraji | Takakuraji | Takakuraji | Takakuraji | Takakuraji | Takakuraji | | | | | | | | | | | | | Miwa clan | Miwa clan | Miwa clan | Miwa clan | Miwa clan | Miwa clan | | | | | | | | | | |
| | | | | | | | | $^4$ Itoku | $^4$ Itoku | $^4$ Itoku | $^4$ Itoku | $^4$ Itoku | $^4$ Itoku | | | | | | | | | Ikisomimi no mikoto [ja] | Ikisomimi no mikoto [ja] | Ikisomimi no mikoto [ja] | Ikisomimi no mikoto [ja] | Ikisomimi no mikoto [ja] | Ikisomimi no mikoto [ja] | | | Ame no Murakumo [ja] | Ame no Murakumo [ja] | Ame no Murakumo [ja] | Ame no Murakumo [ja] | Ame no Murakumo [ja] | Ame no Murakumo [ja] | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | $^4$Amatoyotsuhime no Mikoto [ja] | $^4$Amatoyotsuhime no Mikoto [ja] | $^4$Amatoyotsuhime no Mikoto [ja] | $^4$Amatoyotsuhime no Mikoto [ja] | $^4$Amatoyotsuhime no Mikoto [ja] | $^4$Amatoyotsuhime no Mikoto [ja] | | | Amaoshio no mikoto [ja] | Amaoshio no mikoto [ja] | Amaoshio no mikoto [ja] | Amaoshio no mikoto [ja] | Amaoshio no mikoto [ja] | Amaoshio no mikoto [ja] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | $^5$ Emperor Kōshō | $^5$ Emperor Kōshō | $^5$ Emperor Kōshō | $^5$ Emperor Kōshō | $^5$ Emperor Kōshō | $^5$ Emperor Kōshō | | | | | | | | | | | | | | | | | $^5$Yosotarashi-hime | $^5$Yosotarashi-hime | $^5$Yosotarashi-hime | $^5$Yosotarashi-hime | $^5$Yosotarashi-hime | $^5$Yosotarashi-hime | | | | | | | | | Okitsu Yoso [ja] | Okitsu Yoso [ja] | Okitsu Yoso [ja] | Okitsu Yoso [ja] | Okitsu Yoso [ja] | Okitsu Yoso [ja] | | | | | | | | | | | | | | |
| | | | | | | | | $^6$ Emperor Kōan | $^6$ Emperor Kōan | $^6$ Emperor Kōan | $^6$ Emperor Kōan | $^6$ Emperor Kōan | $^6$ Emperor Kōan | | | | | | | | | Prince Ameoshitarashi [ja] | Prince Ameoshitarashi [ja] | Prince Ameoshitarashi [ja] | Prince Ameoshitarashi [ja] | Prince Ameoshitarashi [ja] | Prince Ameoshitarashi [ja] | | | | | | | | | | | | | | | | | Owari clan | Owari clan | Owari clan | Owari clan | Owari clan | Owari clan | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | $^6$Oshihime [ja] | $^6$Oshihime [ja] | $^6$Oshihime [ja] | $^6$Oshihime [ja] | $^6$Oshihime [ja] | $^6$Oshihime [ja] | | | 〔Wani clan〕 | 〔Wani clan〕 | 〔Wani clan〕 | 〔Wani clan〕 | 〔Wani clan〕 | 〔Wani clan〕 | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | $^7$ Emperor Kōrei | $^7$ Emperor Kōrei | $^7$ Emperor Kōrei | $^7$ Emperor Kōrei | $^7$ Emperor Kōrei | $^7$ Emperor Kōrei | | | | | | | | | $^7$Kuwashi-hime | $^7$Kuwashi-hime | $^7$Kuwashi-hime | $^7$Kuwashi-hime | $^7$Kuwashi-hime | $^7$Kuwashi-hime | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | $^8$ Emperor Kōgen | $^8$ Emperor Kōgen | $^8$ Emperor Kōgen | $^8$ Emperor Kōgen | $^8$ Emperor Kōgen | $^8$ Emperor Kōgen | | | $^8$Utsushikome [ja] | $^8$Utsushikome [ja] | $^8$Utsushikome [ja] | $^8$Utsushikome [ja] | $^8$Utsushikome [ja] | $^8$Utsushikome [ja] | Princess Yamato Totohi Momoso | Princess Yamato Totohi Momoso | Princess Yamato Totohi Momoso | Princess Yamato Totohi Momoso | Princess Yamato Totohi Momoso | Princess Yamato Totohi Momoso | | | Kibitsuhiko-no-mikoto | Kibitsuhiko-no-mikoto | Kibitsuhiko-no-mikoto | Kibitsuhiko-no-mikoto | Kibitsuhiko-no-mikoto | Kibitsuhiko-no-mikoto | | | Wakatakehiko [ja] | Wakatakehiko [ja] | Wakatakehiko [ja] | Wakatakehiko [ja] | Wakatakehiko [ja] | Wakatakehiko [ja] | | | | | | | | | | | | | | | | | | | | |
| | | | | $^9$Ikagashikome | $^9$Ikagashikome | $^9$Ikagashikome | $^9$Ikagashikome | $^9$Ikagashikome | $^9$Ikagashikome | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Hikofutsuoshi no Makoto no Mikoto [ja] | Hikofutsuoshi no Makoto no Mikoto [ja] | Hikofutsuoshi no Makoto no Mikoto [ja] | Hikofutsuoshi no Makoto no Mikoto [ja] | Hikofutsuoshi no Makoto no Mikoto [ja] | Hikofutsuoshi no Makoto no Mikoto [ja] | | | $^9$ Emperor Kaika | $^9$ Emperor Kaika | $^9$ Emperor Kaika | $^9$ Emperor Kaika | $^9$ Emperor Kaika | $^9$ Emperor Kaika | | | | | | | | | Prince Ohiko [ja] | Prince Ohiko [ja] | Prince Ohiko [ja] | Prince Ohiko [ja] | Prince Ohiko [ja] | Prince Ohiko [ja] | | | | | | | | | | | 〔Kibi clan〕 | 〔Kibi clan〕 | 〔Kibi clan〕 | 〔Kibi clan〕 | 〔Kibi clan〕 | 〔Kibi clan〕 | | | | | | | | | | | | | | | | | | | | |
| Yanushi Otake Ogokoro no Mikoto [ja] | Yanushi Otake Ogokoro no Mikoto [ja] | Yanushi Otake Ogokoro no Mikoto [ja] | Yanushi Otake Ogokoro no Mikoto [ja] | Yanushi Otake Ogokoro no Mikoto [ja] | Yanushi Otake Ogokoro no Mikoto [ja] | | | $^{10}$ Emperor Sujin | $^{10}$ Emperor Sujin | $^{10}$ Emperor Sujin | $^{10}$ Emperor Sujin | $^{10}$ Emperor Sujin | $^{10}$ Emperor Sujin | | | | | | | | | $^{10}$Mimaki-hime | $^{10}$Mimaki-hime | $^{10}$Mimaki-hime | $^{10}$Mimaki-hime | $^{10}$Mimaki-hime | $^{10}$Mimaki-hime | | | 〔Abe clan〕 | 〔Abe clan〕 | 〔Abe clan〕 | 〔Abe clan〕 | 〔Abe clan〕 | 〔Abe clan〕 | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Takenouchi no Sukune | Takenouchi no Sukune | Takenouchi no Sukune | Takenouchi no Sukune | Takenouchi no Sukune | Takenouchi no Sukune | | | $^{11}$ Emperor Suinin | $^{11}$ Emperor Suinin | $^{11}$ Emperor Suinin | $^{11}$ Emperor Suinin | $^{11}$ Emperor Suinin | $^{11}$ Emperor Suinin | | | $^{11}$Saho-hime | $^{11}$Saho-hime | $^{11}$Saho-hime | $^{11}$Saho-hime | $^{11}$Saho-hime | $^{11}$Saho-hime | | | | | $^{12}$Hibasu-hime [ja] | $^{12}$Hibasu-hime [ja] | $^{12}$Hibasu-hime [ja] | $^{12}$Hibasu-hime [ja] | $^{12}$Hibasu-hime [ja] | $^{12}$Hibasu-hime [ja] | | | | | | | Yasaka Iribiko | Yasaka Iribiko | Yasaka Iribiko | Yasaka Iribiko | Yasaka Iribiko | Yasaka Iribiko | | | | | | | | | Toyosukiiri-hime [ja] | Toyosukiiri-hime [ja] | Toyosukiiri-hime [ja] | Toyosukiiri-hime [ja] | Toyosukiiri-hime [ja] | Toyosukiiri-hime [ja] | Nunaki-iri-hime [ja] | Nunaki-iri-hime [ja] | Nunaki-iri-hime [ja] | Nunaki-iri-hime [ja] | Nunaki-iri-hime [ja] | Nunaki-iri-hime [ja] |
| | | | | | | | | | | | | | | | | | | | | | | | | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | Yamatohime-no-mikoto | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 〔Katsuragi clan〕 | 〔Katsuragi clan〕 | 〔Katsuragi clan〕 | 〔Katsuragi clan〕 | 〔Katsuragi clan〕 | 〔Katsuragi clan〕 | $^{13}$Harima no Inabi no Ōiratsume [ja] | $^{13}$Harima no Inabi no Ōiratsume [ja] | $^{13}$Harima no Inabi no Ōiratsume [ja] | $^{13}$Harima no Inabi no Ōiratsume [ja] | $^{13}$Harima no Inabi no Ōiratsume [ja] | $^{13}$Harima no Inabi no Ōiratsume [ja] | | | | | $^{12}$ Emperor Keiko | $^{12}$ Emperor Keiko | $^{12}$ Emperor Keiko | $^{12}$ Emperor Keiko | $^{12}$ Emperor Keiko | $^{12}$ Emperor Keiko | | | | | | | | | | | | | $^{14}$Yasakairi-hime [ja] | $^{14}$Yasakairi-hime [ja] | $^{14}$Yasakairi-hime [ja] | $^{14}$Yasakairi-hime [ja] | $^{14}$Yasakairi-hime [ja] | $^{14}$Yasakairi-hime [ja] | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | Otoyo no mikoto [ja] | Otoyo no mikoto [ja] | Otoyo no mikoto [ja] | Otoyo no mikoto [ja] | Otoyo no mikoto [ja] | Otoyo no mikoto [ja] | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | Futaji Irihime [ja] | Futaji Irihime [ja] | Futaji Irihime [ja] | Futaji Irihime [ja] | Futaji Irihime [ja] | Futaji Irihime [ja] | | | Yamato Takeru | Yamato Takeru | Yamato Takeru | Yamato Takeru | Yamato Takeru | Yamato Takeru | | | Miyazu-hime | Miyazu-hime | Miyazu-hime | Miyazu-hime | Miyazu-hime | Miyazu-hime | | | Takeinadane [ja] | Takeinadane [ja] | Takeinadane [ja] | Takeinadane [ja] | Takeinadane [ja] | Takeinadane [ja] | Ioki Iribiko | Ioki Iribiko | Ioki Iribiko | Ioki Iribiko | Ioki Iribiko | Ioki Iribiko | $^{13}$Emperor Seimu | $^{13}$Emperor Seimu | $^{13}$Emperor Seimu | $^{13}$Emperor Seimu | $^{13}$Emperor Seimu | $^{13}$Emperor Seimu | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $^{14}$Emperor Chūai | $^{14}$Emperor Chūai | $^{14}$Emperor Chūai | $^{14}$Emperor Chūai | $^{14}$Emperor Chūai | $^{14}$Emperor Chūai | | | $^{15}$Empress Jingū | $^{15}$Empress Jingū | $^{15}$Empress Jingū | $^{15}$Empress Jingū | $^{15}$Empress Jingū | $^{15}$Empress Jingū | | | | | | | | | | | Homuda Mawaka | Homuda Mawaka | Homuda Mawaka | Homuda Mawaka | Homuda Mawaka | Homuda Mawaka | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $^{15}$Emperor Ōjin | $^{15}$Emperor Ōjin | $^{15}$Emperor Ōjin | $^{15}$Emperor Ōjin | $^{15}$Emperor Ōjin | $^{15}$Emperor Ōjin | | | | | | | | | | | | | | | $^{16}$Nakatsuhime | $^{16}$Nakatsuhime | $^{16}$Nakatsuhime | $^{16}$Nakatsuhime | $^{16}$Nakatsuhime | $^{16}$Nakatsuhime | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | $^{16}$Emperor Nintoku | $^{16}$Emperor Nintoku | $^{16}$Emperor Nintoku | $^{16}$Emperor Nintoku | $^{16}$Emperor Nintoku | $^{16}$Emperor Nintoku | | | | | | | | | | | | | | | | | | | | | | | | |