Nanban trade
Since 1557, Portuguese Macau had been the single center for exchange between China and Japan, and from there to Europe via Goa. In 1571 Nagasaki was opened for Portuguese ships, after an agreement with "daimyō" Ōmura Sumitada who converted to Catholicism, and a flourishing trade established between the two cities, that would become known as "Nanban trade period".