According to written records in China, their names were San (讃), Chin (珍), Sai (濟), Kō (興) and Bu (武).
On the other hand, archeological evidence, such as the inscriptions on the Inariyama and Eta Funayama Sword, also supports the idea that Bu is an equivalent of Emperor Yūryaku, who was called Wakatakeru Ōkimi by his contemporaries.
King Chin asked the titles ”使持節都督倭百済新羅任那秦韓慕韓六国諸軍事安東大将軍倭国王" (Shijisetsu, Totoku, Wa, Baekje, Silla, Mimana, Shinkan, Bokan, Rokkoku-Shogunji, Antō-Shōgun, Wa-Kokuō).
The Song dynasty did not approve that King Chin would hold the power of militarily ruling the State area of Baekje.
(King Bu also asked this power - militarily ruling the Baekje State -, but the Song did no approve as well.
)[7] King Bu asked the Title 開府儀同三司 (Kaifu Gidō-Sanshi), but the Emperor of Song dynasty did not approve, and instead bestowed the Titles "使持節都督倭新羅任那加羅秦韓慕韓六国諸軍事安東大将軍倭王" (Shijisetsu, Totoku, Wa, Silla, Mimana, Kara, Shinkan, Bokan, Rokkoku-Shogunji, Antō-Shōgun, Wa-Kokuō).