On October 22, 1596, Hideyoshi had an interview with an envoy from Ming in Osaka-jo Castle, and he became furious when seeing the line of a diplomatic message dispatched by the sovereign in Ming, which said that 'We hereby especially recognize you and bestow upon you the title of King of Japan.'
慶長元年9月1日、大坂城において明使を引見した秀吉は明の国書のなかの、「茲特封爾為日本国王賜之誥命(ここに特に爾を封じて日本国王に誥命賜う)」の部分を見て激怒した。