In the red seal license to Kennyo of Honganji Temple as of June 1,1587 during staying in Kyusyu, one of the papers to show Hideyoshi's idea on abroad, Hideyoshi wrote that 'the Emperor says that Korean King should come to Japan as an ancient example of Imperial Court' (Honganji Bunsh).
秀吉の対外認識について示す文書の1つに、九州遠征中の天正15年6月1日付で本願寺顕如に充てた朱印状の中で、「我朝之覚候間高麗国王可参内候旨被仰遣候」（「本願寺文書」）とある。