 Hideyoshi blamed the Portuguese and Jesuits for this slave trade and banned Christian proselytizing as a result.Some Korean slaves were bought by the Portuguese and brought to Portugal from Japan, where they had been among the tens of thousands of Korean prisoners of war transported to Japan during the Japanese invasions of Korea (1592–98).Historians pointed out that at the same time Hideyoshi expressed his indignation and outrage at the Portuguese trade in Japanese slaves, he himself was engaging in a mass slave trade of Korean prisoners of war in Japan.