Chikushikoku

Chikushikoku (竹斯国) is the name of a country or land that appears in the Book of Sui Dynasty and History of the Northern Dynasties in the history of China as being in the Japan region. or land name that appears in Northern History. It is compared to Tsukushi Province.

Outline
The country of Chikushikoku appears in "Book of Sui" volume 81, biography 46 "Eastern Barbarians, the country of Buyeo" and "Northern History" volume 94, biography 82. It is mentioned immediately after the passage "The Emperor of the Land where the Sun Rises" in the letter sent by the Buyeo (Wa) envoy, Tarishihiko, to Emperor Yang of Sui.

Descriptions in the Sui Dynasty and the Northern History
It describes the route taken by the envoys from the Sui Dynasty. The envoys went from Baekje to Takeshima (not an island that has been disputed by Japan and Korea since the late 20th century), Tsushima to Iki, and then arrived at "Takeshikoku. The area east of there is said to be the territory of Japan. The reason why "Sui Dynasty" refers to "Hye-qing" and "Northern History" refers to "Hye-se-qing" is that "Sui Dynasty" was Naming taboo.

Different theories
The common theory is that the "其人・・・・・・不能明也" part of the above Chinese historical document is an explanation of the Shin'okoku, but the following theory exists.


 * According to Yozaburo Ishihara, it is thought that people from Takeshikoku (Tsukushi Province) were considered to be from the same birthplace as Huaxia.