・Since a Portuguese trading ship entered the port of Nagasaki in 1571, Portuguese people engaging in trade stayed in the city of Nagasaki.
・As part of its anti-Christian policy, the Edo Shogunate had craftsmen and merchants build an artificial island called “Dejima,” off the coast of Nagasaki, and transferred the Portuguese traders to Dejima in 1636.
・In 1639, Portuguese ships were prohibited from visiting Japan. Even after the Dutch trading post was moved from Hirado to Nagasaki in 1641, restrictions were imposed on the profession of Christian faith by Dutch trading post officials. Dejima stood as a symbol of national isolation and the ban on Christianity.