In September 252, the king of Paekche, met Nagahiko CHIKUMA, an envoy from Japan, and gave him one seven-pronged sword, one nanatsuko no kagami (a mirror with seven small decoration mirrors), and various other treasures, hoping to form a friendship ("Nihonshoki," from the article dated September 252 during the reign of Empress Jingu).
五十二年秋九月丁卯朔丙子久氐等從千熊長彥詣之　則獻七枝刀一口七子鏡一面及種種重寶仍啟曰臣國以西有水源出自谷那鐵山其邈七日行之不及當飲是水便取是山鐵以永奉聖朝乃謂孫枕流王曰今我所通東海貴國是天所啟是以垂天恩割海西而賜我由是國基永固汝當善脩和好聚斂土物奉貢不絕雖死何恨自是後每年相續朝貢焉（『日本書紀』神功皇后摂政五十二年九月の条）