For brief time, there was quite a lot of Christian Samurai. Around the period of Japan's reunification, Spain and Portugal traders provided a vital component to gunpowder. Catholic Missionaries were allowed to preached to all walks of Japanese society, from the richest to the poorest. This included both samurai and daimyō (I.E. Japanese fuedal lords). Some notable Christian daimyōs included Konishi Yukinaga (who famously did not commit seppoku after a horrible military defeat) and Dom Justo Takayama (who was declared "blesssed" by the Catholic Church). Either by force or by choice, many of their Samurai converted to Christianity as well. While Christianity never became a majority of the nation, the religion found it's place in it's socity and leaders joined for the trade benefits it produced.

However, after Japanese failed invasion of Korea, the Shoguns became isolationist, viewing all outside forces with suspicion. The Shogun started prosecuting Christians hard and Christianity was driven underground, particularly after the Shimabara Rebellion of 1637. Most of the remaining Christians in the nation were forcibly deported to European far East colonies.