# Emperor Kaika

Emperor Kaika (開化天皇, Kaika-tennō), also known as Wakayamato Nekohiko Ōbibi no Mikoto (若倭根子日子大毘毘命) in the Kojiki, and Wakayamato Nekohiko Ōbibi no Sumeramikoto (稚日本根子彦大日日天皇) in the Nihon Shoki was the ninth 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. Kaika 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. Kaika's reign allegedly began in 158 BC. He had one wife and three consorts whom he fathered five children with. After his death in 98 BC, one of his sons supposedly became Emperor Sujin.

## Legendary narrative

In the Kojiki and Nihon Shoki, only Kaika's name and genealogy were recorded. The Japanese have traditionally accepted this sovereign's historical existence, and an Imperial misasagi or tomb for Kaika is currently maintained; however, no extant contemporary records have been discovered that confirm a view that this historical figure actually reigned. Kaika was born sometime in 208 BC, and is recorded as being the second son of Emperor Kōgen. His empress mother was named Utsushikome, who was the daughter of Oyakuchisukune. Before he was enthroned sometime in 158 BC, his pre-ascension name was Prince Nikohiko Ō-hibi no Mikoto. The Kojiki records that he ruled from the palace of Sakaihara-no-miya (軽之堺原宮, and in the Nihon Shoki as 軽境原宮) at Karu in what would come to be known as Yamato Province. Emperor Kaika had a chief wife (empress) named Ikagashikome, along with three consorts of which he fathered five children with. Kaika ruled until his death in 98 BC; his second son was then enthroned as the next emperor. His son/heir to the throne was posthumously named Sujin by later generations, and is the first emperor that historians say might have actually existed.

## Known information

The existence of at least the first nine Emperors is disputed due to insufficient material available for further verification and study. Kaika is thus regarded by historians as a "legendary Emperor", and is considered to have been the eighth of eight Emperors without specific legends associated with them. The name Kaika-tennō was assigned to him posthumously by later generations. His name might have been regularized centuries after the lifetime ascribed to Kaika, possibly during the time in which legends about the origins of the imperial dynasty were compiled as the chronicles known today as the Kojiki. While the actual site of Kaika's grave is not known, the Emperor is traditionally venerated at a memorial Shinto shrine (misasagi) in Nara. The Imperial Household Agency designates this location as Kaika's mausoleum, and its formal name is Kasuga no Izakawa no saka no e no misasagi.
Like Emperor Kōshō and Emperor Kōrei, there is a possibility that "Kaika" could have lived instead in the 1st century (AD). Historian Louis Frédéric notes this idea in his book Japan Encyclopedia where he says "more likely early AD", but this remains disputed among other researchers. 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: Ikagashikome (伊香色謎命), Oohesoki's daughter
** Prince Mimakiirihikoinie (御間城入彦五十瓊殖尊), later Emperor Sujin
** Princess Mimatsuhime (御真津比売命)
* Consort: Taniwanotakano-hime (丹波竹野媛), Taniwa no Ooagatanushi Yugori's daughter
** Prince Hikoyumusu (彦湯産隅命)
* Consort: Hahatsu-hime (姥津媛), Prince Waninishisaihito's daughter
** Prince Hikoimasu (彦坐王)
* Consort: Washi-hime (鸇比売), Katsuragi no Tarumi no Sukune's daughter
** Prince Taketoyohazurawake (建豊波豆羅和気王)

## 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 | | | | | | | | | | | | | | | | | | | | | | | | |