Sai of Wa

Sai of Wa (済) was a king of Wa in the middle of the 5th century (Kofun era).^[1] He was also known as Wa Osai.^[1]

Sai of Wa
King of Wa
Predecessor	Chin of Wa
Successor	Ko of Wa
Issue	Ko of Wa, Bu of Wa
Posthumous name Emperor Ingyo?

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Genealogy of the Five kings of Wa and Emperors

Book of Song	Book of Liang
San (421, 425) Chin (438) Sai (443, 451) Kō (462) Bu (478)	San (Chin) Sai Kō Bu
Genealogy of Emperors in Nihon Shoki
15 Ōjin (Homuta-wake) 16 Nintoku (Oho-sazaki) 17 Richū (Izaho-wake) 18 Hanzei (Mitsuha-wake) 19 Ingyō (Oasatsuma-wakugo) Prince Ichinohe-Oshiha Prince Kinashi-Karu 20 Ankō (Anaho) 21 Yūryaku (Wakatakeru)

Father of Ko and Wu, he was one of the Wa. He is considered to be the 19th Emperor Ingyo.

Records

Book of Liang

The Biography of Liang

In the Book of Liang, the article on "Yamato" (梁書倭伝) states that his son Je stood up after the death of "Ya", and his son Xing stood up after his death.^[2]。

History of the Southern Dynasties

In the History of the Southern Dynasties, the article on the Japanese Kingdom (Nan shi wagu den) describes the contents of the Song Shu Chronicles.

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Table of Changes in the General Names of Koguryo Kings, Baekje Kings, and Japanese Kings^[3]

Year	Goguryeo	Baekje	Wa
317	Eastern Jin
372		Geunchogo of Baekje
386		Jinsa of Baekje
413	Jangsu of Goguryeo
416	Jangsu of Goguryeo	Jeonji of Baekje
420	Liu Song dynasty
		Jeonji of Baekje
421			San of Wa
438			Chin of Wa
443			Sai of Wa
451			Sai of Wa
457		Gaero of Baekje
462			Ko of Wa
463	Jangsu of Goguryeo
478			Bu of Wa
479	Southern Qi
			Bu of Wa
480	Jangsu of Goguryeo	Moudu
490		Dongseong of Baekje
494	Munjamyeong of Goguryeo
502	Liang dynasty
	Munjamyeong of Goguryeo	Dongseong of Baekje	Bu of Wa

Historical investigation

On the continuity between Je and Chin

In the article in the Sung Shu, Je takes the surname "Wa" (倭) as did the previous Japanese king Jin, but does not clarify his relationship to Jin. Since they do not name the continuation, there is a theory that Je and Chin were not close blood relatives, and since the Nihon Shoki shows a struggle in the succession to the throne after Emperor Nintoku, the possibility of the existence of such a struggle over the throne is pointed out ^[4] In addition, since the Wazui [ja] can be seen as a particularly powerful royal family in the Chin period, there is a theory that there were two royal forces at that time (Mozu Kofun Cluster and Furuichi Kofun Cluster), and that Je may have been a lineage of this Wazui ^[4]。

Comparison of the tombs

During the period of activity of the Five kings of Wa, the tombs of the great kings were constructed in the Mozu Tombs and Furuichi Kofun Cluster (Osaka Prefecture, Sakai City, Habikino City, Fujiidera), and Je's tomb is assumed to be one of them.^[5] These tombs are now designated as mausoleums by the Miyouchi Agency, so there is a lack of archaeological data to date them, but one theory compares them to the Ichinoyama Kofun (the current imperial tomb of Emperor Ingyo).

Another archaeological source is the "Gift of Wang" excavated from the Inaridai Kofun Group (Ichihara City, Chiba Prefecture). (or Chin), since he is self-explanatory only by writing "Wang".^[6][4] It should be noted, however, that the iron sword from Inariyama burial mound inscription and the iron sword from Etafuneyama burial mound [ja] inscription are distinct from the "Great King" of the Inariyama Sword^[4]。