Daidōji Yūzan

Who They Were

Daidōji Yūzan (大道寺友山) was a samurai and military scholar of the Edo period, the long stretch of Japanese history running from 1603 to 1868 when the Tokugawa shoguns ruled from Edo, the city now called Tokyo. He lived from 1639 to December 11, 1730, dying in Edo at the age of ninety-one. He belonged to the Daidōji family, and his father was Daidōji Shigehisa.

His reputation rests less on battles than on a book. In his later years Yūzan wrote the Budō Shoshin-shū (武道初心集), a manual of warrior ethics that circulated widely and shaped how ordinary samurai understood their duties. He was also a gungaku scholar — gungaku (軍学) means the academic study of military science, the systematic analysis of strategy, fortification, and command rather than mere fighting technique.

Life and Career

Yūzan was born in 1639, in the sixteenth year of the Kan'ei era (寛永), in Fushimi in Yamashiro Province, the district that is today Fushimi-ku in Kyoto. His lineage carried weight: he was the son of Daidōji Shigehisa, grandson of Daidōji Naoshige, and great-grandson of Daidōji Masashige, an important advisor to the Later Hōjō clan, one of the great warrior houses of the preceding centuries.

That inheritance came with hardship. Shigehisa had served Matsudaira Tadateru, the daimyō — a daimyō (大名) being a territorial lord — of the Echigo Takada fief. In 1619 Tadateru was dismissed from service, and Shigehisa became a rōnin (浪人), a masterless samurai, when Yūzan was a small child. The family's standing had to be rebuilt rather than inherited.

Yūzan rebuilt it through study. In Edo he trained in the arts of war under Obata Kagenori, Hōjō Ujinaga (北条氏長), Yamaga Sokō, and others. He then travelled as a lecturer, teaching military science as a guest of the Asano at the Hiroshima fief, of the Matsudaira clan at the Aizu fief, and of the Matsudaira clan at the Fukui fief, along with other places across Japan. Lecturing for provincial lords was a recognised career for a samurai of learning in an era with few wars to fight.

Why They Matter

The Tokugawa peace meant that most samurai never drew a sword in anger. Their identity as warriors had to be sustained by something other than combat, and Yūzan's writing addressed exactly that problem. The Budō Shoshin-shū — the title means something like "Collected Writings on the Warrior's First Intentions" — was an introduction to warrior ethics aimed at the middle- and lower-ranking samurai, not at generals. It told men who would never command armies how to conduct themselves, and it was read widely among precisely those ranks.

Its reach extended far beyond its own century. The text was translated into English by Arthur Lindsay Sadler as The Code of the Samurai in 1941, with a further edition in 1988; by William Scott Wilson as Budoshoshinshu: The Warrior's Primer; and by Thomas Cleary. Few Edo-period ethical treatises by a working lecturer have stayed in print in English for that long.

Yūzan's own career also illustrates how military knowledge functioned as a profession in peacetime. He was not a celebrated combatant but a teacher and author, hired by fief after fief to explain the theory of war to men whose ancestors had practised it.

The Name in Japanese

The full name is written 大道寺友山.

• Kana reading: だいどうじ ゆうざん
• Romaji: Daidōji Yūzan

Broken down character by character:

大道寺 — the family name, read Daidōji.

• 大 — read dai here; it means "great" or "large." It is one of the most common elements in Japanese names and place names.
• 道 — read dō here; it means "way," "road," or "path." It is the same character used in budō (武道), the "way of the warrior," and in shodō, calligraphy.
• 寺 — read ji here; it means "temple." In names it often appears in compounds, and it is the same character found in temple names across Japan.

友山 — the given name, read Yūzan.

• 友 — read yū here; it means "friend" or "companion."
• 山 — read zan here; it means "mountain." On its own the character is read yama, but in compounds it frequently shifts to san or zan.

Two points are worth noting for learners. First, the readings above are the ones used in this specific name, not the characters' most common everyday readings — 山 as zan rather than yama, for instance, and 道 as dō rather than michi. Second, the given name is a two-character compound pronounced with the Chinese-derived on reading throughout, which gives it a formal, scholarly ring appropriate to a man known as a lecturer and author.

Legacy

Yūzan's son, Daidōji Shigetaka (大道寺重高), became a retainer of the Fukui fief with a stipend of 300 koku — a koku (石) being a measure of rice, conventionally enough to feed one person for a year, and the standard unit by which samurai stipends were reckoned. The family's recovery from rōnin status in 1619 to a secure stipend in the next generation was complete.

The Budō Shoshin-shū outlived both father and son. Through the Sadler, Wilson, and Cleary translations it became one of the small group of Edo-period texts through which English-speaking readers encounter samurai ethics, and it is the reason a peacetime lecturer from Fushimi is still named alongside the far more famous Hagakure in discussions of warrior thought.