In the memorial to the Emperor by Waobu (the last king of ancient Japan) in 478 in "Sungshu" (Book of the Sung dynasty), there is a description 'we conquered east and west of Japan and also a country in overseas.'
『宋書』478年の倭王武の上表文で、「東征毛人五十五国、西服衆夷六十六国、渡平海北九十五国」とある。