Japanese literature about samurai has a long and rich history, and includes written works such as medieval war chronicles, waka poetry, and more.

Literature of the 13th to 16th centuries

Heike Monogatari Written in 1371, The Heike Monogatari chronicles the struggle between the Minamoto and Taira clans for control of Japan at the end of the 12th century, a conflict known as the Genpei War. The Heike Monogatari is one of the longest and most beautifully composed of the genre called gunki monogatari, or war chronicles. Clearly depicted throughout the Heike Monogatari is the ideal of the cultivated warrior. This ideal is symbolized in the character 斌 or uruwashii, meaning a situation of balance and harmony between the exterior pattern, or beauty (文), and the interior essence, or substance (武). Men who possess this quality will be as accomplished in the world of the arts as in the world of martial skill and courage.

One such example is Taira no Tadanori:

Friends and foes alike wet their sleeves with tears and said, "What a pity! Tadanori was a great general, pre-eminent in the arts of both sword and poetry." (Kitagawa and Tsuchida, 1975)

The warriors in the Heike Monogatari served as models for the educated warriors of later generations, and the ideals depicted by them were not assumed to be beyond reach. Rather, these ideals were vigorously pursued in the upper echelons of warrior society and recommended as the proper form of the Japanese man of arms. With the Heike Monogatari, the image of the Japanese warrior in literature came to its full maturity. (Wilson, 1982)

The Message Of Master Gokurakuji In the year 1256, the Shogunal Deputy in Kyoto, Hōjō Shigetoki (1198-1261) wrote a letter to his son and house elders of his clan. The letter, now known as "The Message Of Master Gokurakuji", emphasized the importance of loyalty to one's master:

When one is serving officially or in the master's court, he should not think of a hundred or a thousand people, but should consider only the importance of the master. Nor should he draw the line at his own life or anything else he considers valuable. Even if the master is being phlegmatic and one goes unrecognized, he should know that he will surely have the divine protection of the gods and Buddhas ... One should rely on neither age nor youth. But he who reveres the master and protects the people may be called a sage.

If one treats men roughly in this existence, he will be roughly treated by them in the next, for karma is never-ending in all things. And if one would rid himself of bad karma in this round of existence, he should treat well those who are not so kind to him. For if one is dealt with kindly by people, he can rejoice in his previous existence; but if he is handled roughly in this world, his previous existence is a matter for regret."

Written in kanamajiri style, "The Message Of Master Gokurakuji" is described as being "....basically concerned with man's moral duties and the ideal behavior for leaders of the warrior class. The predominant tone of the work is a Buddhist sympathy for all living beings and an awareness of the functions of karma. Women, children, and those of lower social standing are to be treated kindly and with regard, and even the concept of loyalty to superiors is dealt with more in a religious sense than a Confucian one."

The Chikubashō The feudal lord Shiba Yoshimasa (1350 – 1410) wrote the Chikubashō, a set of precepts for the young men of the Shiba clan. Chikubashō translates literally as "The Bamboo Stilt Anthology". Shiba Yoshimasa was a warrior leader during the Namboku and Muromachi Periods, and was known as an administrator, general, and poet. The Chikubashō consists of one volume and was completed in 1383. William Scott Wilson, author of Ideals of the Samurai describes the Chikubasho as "A short list of precepts written in a classical Japanese style, the Chikubasho displays both the ethical morality of the warrior and the tasteful lifestyle of the aristocracy. Its tone is a combination of a manly Confucian approach reflecting honesty and fairness, and a Buddhist sympathy for others."

In his writings, Shiba Yoshimasa dictated that a warrior should not hesitate to lay down his life for an important cause such as the defense of the emperor:

First, a man whose profession is the use of arms should think and then act upon not only his own fame, but also that of his descendants. He should not scandalize his name forever by holding his one and only life too dear. On the other hand, in the light of this, to consider this life that is given to us only once as nothing more than dust and ashes, and lose it at a time when one should not, would be to gain a reputation that is not worth mentioning. One's main purpose in throwing away his life is to do so either for the sake of the Emperor or in some great undertaking of a military general.

Imagawa Ryōshun (1325–1420) Imagawa Ryōshun was a leading general and strategist of his time. His writings are central to the development of bushidō and represent the "Way of the Warrior" at its maturity. Historian Carl Steenstrup describes Imagawa thusly: "He became one of the most influential literary critics of his time, a competent historian, and expert in the philosophy of government, and a prolific poet. In addition, he showed genuine talent for public administration, and gained military experience at an early age." Imagawa wrote prolifically despite being posted to military hotspots by the shōgun. His job was to suppress rebellion by rival samurai clans. Famed for his writings "Nan Taiheiki" and "Michiyukiburi", he penned "The Regulations" to his brother Tadaki in traditional kanbun script. Having taken Buddhist vows, Imagawa Ryoshun was greatly admired as having achieved the warrior ideal—striking a balance between the military and literary arts. According to Steenstrup, "The Letter soon became a historical force in its own right. First it became a textbook of ethics for the Imagawa clan, including its retainers. From the Imagawa, an appreciation of the text spread to other clans; as early as before the outbreak of the Ōnin War, 1467, the Letter appears to have been used as an Office Manual for warrior bureaucrats even outside the Imagawa domains. When the Tokugawa established their hegemony in 1600, the Letter was already in use as a primer. The staff of Ieyasu included the text in the collection of the most important 'house-laws' which they compiled, probably for use as reference material in the drafting of the fundamental laws of the Tokugawa system which were issued in 1615." Even after Japan's feudal era, they were a required study for traditional Japanese as a guide to proper moral behavior. Widely respected, "The Regulations" remained popular until World War II.

Hōjō Nagauji (1432–1519) Near the beginning of the 16th century, the Samurai general Hōjō Nagauji (1432–1519) would write: "Above all, believe in the gods and Buddhas. To worship the gods and Buddhas is the correct conduct for a man. It can be said that one will be in conformity with the feelings of the gods and Buddhas if he will simply make his heart straightforward and calm, respect honestly and wholeheartedly those above him and have pity on those below, consider that which exists to exist and that which does not exist to not exist, and recognize things just as they are. With such a frame of mind, one will have divine protection even though he does not pray. But if his mind is not straight, he had best be prudent lest it be said that he has been abandoned by Heaven, prayerful or not. It is hardly necessary to record that both Learning and the military arts are the Way of the Warrior, for it is an ancient law that one should have Learning on the left and the martial arts on the right. But this is something that will not be obtainable if one has not prepared for it beforehand."

Hōjō concluded his list of precepts by stating: "To be a samurai is to be polite at all times".

Also known as Hōjō , Lord Hōjō was greatly admired by other daimyōs as a good general and administrator. In addition to attracting more samurai to Odawara, he cut crop taxes from one-half to two-fifths of the harvest, and generally looked out for the welfare of his people.

Hōjō's Twenty-One Precepts were written some time after Hōjō had become a priest, and reflect the fullness of his own experiences. The articles are basically rules for the daily life of the common warrior, and show his familiarity and sympathy for those in the lower echelons. The subject matter ranges from encouraging the study of poetry and horsemanship and the avoidance of games like chess and go, to advice on how to keep one's house in better order and well-protected. There is a strong tone of self-reliance throughout, reflecting Hōjō 's unsparingly meticulous character and his own rise to power.

Takeda Shingen (1521–1573) The great Warlord Takeda Shingen (1521–1573) wrote in his house codes: "Everyone knows that if a man doesn't hold filial piety toward his own parents he would also neglect his duties toward his lord. Such a neglect means a disloyalty toward humanity. Therefore such a man doesn't deserve to be called 'samurai'."

Katō Kiyomasa (1562–1611) Some famous sengoku daimyōs used the word Bushidō in their writings. In a set of precepts addressed to "All samurai, regardless of rank" the feudal lord Katō Kiyomasa (1562–1611) orders his men to follow it:

If a man does not investigate into the matter of Bushidō daily, it will be difficult for him to die a brave and manly death. Thus it is essential to engrave this business of the warrior into one's mind well ... One should put forth great effort in matters of learning. One should read books concerning military matters, and direct his attention exclusively to the virtues of loyalty and filial piety ... Having been born into the house of a warrior, one's intentions should be to grasp the long and the short swords and to die.

Katō Kiyomasa was one of the most ferocious Samurai who ever lived. The son of a blacksmith, he joined Toyotomi Hideyoshi at age 18 and became legendary for his ferocity in combat, distinguishing himself at the battle of Shizugatake. A senior general, he was awarded lordship of Kumamoto castle in Higo at the age of 26.

Awarded a large fief of 250,000 koku in Higo province, Katō ruthlessly suppressed Christianity. A follower of Nichiren Buddhism, he soon came into conflict with the lord of a neighboring province, a Christian named Konishi Yukinaga. In 1592, Kato Kiyomasa led part of Hideyoshi's army in his campaigns in Korea—alongside his rival, the daimyō Konishi. He occupied the city of Seoul and later crossed the Tumen River into China. Historian Stephen Turnbull describes the horror and destruction of the Korean Invasions in several of his books as seen through the eyes of the Priest Keinen who accompanied the samurai during the campaign.[De Bary, W., Keene, Donald, Tanabe, George, Gluck, Carol, Tiedemann, Arthur, & Tsunoda, Ryusaku. (2001). Sources of Japanese Tradition, From earliest times to 1600 (2.nd ed., Introduction to Asian Civilizations). New York: Columbia University Press. Page 467], Keinen did not travel to Korea until the second Invasion in 1597, and he was accompanying Lord Hishū, not Katō Kiyomasa. Keinen's diary "Korea Day by Day" was so controversial that it remained unpublished until 1965. Turnbull also described Kato Kiyomasa's motivation for attacking the Jurchens of Manchuria in 1592 was 'to show the savages the mettle of the Japanese'.

Kato stood poised to conquer all of Asia, but a Korean naval blockade prevented him from receiving reinforcements and provisions necessary to support his 150,000-man army.