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Samurai were the hereditary military nobility and officer caste of medieval and early-modern Japan from the 12th century to their abolition in the 1870s. They were the well-paid retainers of the daimyo (the great feudal landholders). They had high prestige and special privileges such as wearing two swords. They cultivated the bushido codes of martial virtues, indifference to pain, and unflinching loyalty, engaging in many local battles. During the peaceful Edo era (1603 to 1868) they became the stewards and chamberlains of the daimyo estates, gaining managerial experience and education. In the 1870s they were 5% of the population. The Meiji Revolution ended their feudal roles and they moved into professional and entrepreneurial roles. Their memory and weaponry remain prominent in Japanese popular culture.

The philosophies of Buddhism and Zen, and to a lesser extent Confucianism and Shinto, influenced the samurai culture. Zen meditation became an important teaching, because it offered a process to calm one's mind. The Buddhist concept of reincarnation and rebirth led samurai to abandon torture and needless killing, while some samurai even gave up violence altogether and became Buddhist monks after coming to believe that their killings were fruitless.
Some were killed as they came to terms with these conclusions in the battlefield. The most defining role that Confucianism played in samurai philosophy was to stress the importance of the lord-retainer relationship—the loyalty that a samurai was required to show his lord.

Literature on the subject of bushido such as Hagakure ("Hidden in Leaves") by Yamamoto Tsunetomo and Gorin no Sho ("Book of the Five Rings") by Miyamoto Musashi, both written in the Edo period (1603–1868), contributed to the development of bushidō and Zen philosophy.

The philosophies of Buddhism and Zen, and to a lesser extent Confucianism and Shinto, are attributed to the development of the samurai culture. According to Robert Sharf, "The notion that Zen is somehow related to Japanese culture in general, and bushidō in particular, is familiar to Western students of Zen through the writings of D. T. Suzuki, no doubt the single most important figure in the spread of Zen in the West."

In an account of Japan sent to Father Ignatius Loyola at Rome, drawn from the statements of Anger (Han-Siro's western name), Xavier describes the importance of honor to the Japanese (Letter preserved at College of Coimbra):

In the first place, the nation with which we have had to do here surpasses in goodness any of the nations lately discovered. I really think that among barbarous nations there can be none that has more natural goodness than the Japanese. They are of a kindly disposition, not at all given to cheating, wonderfully desirous of honour and rank. Honour with them is placed above everything else. There are a great many poor among them, but poverty is not a disgrace to any one. There is one thing among them of which I hardly know whether it is practised anywhere among Christians. The nobles, however poor they may be, receive the same honour from the rest as if they were rich.もっと詳しく