Yamana Sōzen

Who They Were

Yamana Sōzen (山名宗全) was a daimyō — a great territorial lord — of the Muromachi period, the stretch of Japanese history running from 1336 to 1573. He was born on 6 July 1404 and died in Kyoto on 15 April 1473. He held the rank of daimyō and lived his life as a samurai, the warrior class that dominated Japanese politics in this era.

He is remembered above all as one of the two great warlords whose rivalry tore Japan apart in the Ōnin War, fought in and around Heian-kyō, the city now called Kyoto. His opponent was Hosokawa Katsumoto. The two men stood at the head of opposing coalitions of shogunal daimyō, lords who owed their standing to the Ashikaga shogunate.

Sōzen was born into the Yamana family, a major warrior house, as the son of Yamana Tokihiro. His mother was a daughter of Yamana Ujikiyo. He was originally named Yamana Mochitoyo (山名持豊) and took the name Sōzen when he became a monk. Because of his red complexion he was sometimes called Aka-nyūdō, "the Red Monk" — nyūdō being a term for a man who had taken Buddhist vows.

Life and Career

Sōzen was born in the eleventh year of the Ōei era (応永), a Japanese era name used in the early fifteenth century. He belonged by birth to the Yamana, one of the most powerful samurai families of the Muromachi age, and inherited his position as its head. His father, Yamana Tokihiro, and his mother, a daughter of Yamana Ujikiyo, placed him within the tight network of marriage and blood that bound the great warrior houses together.

He fathered many children, among them Kenyoshi Yamana, Yamana Katsutoyo, Yamana Tokitoyo, Yamana Koretoyo, Masatoyo Yamana, Yamana Toyohisa, and Haru Hayashiji. Two of his daughters married into other great houses: one became the mother of Ōuchi Masahiro, and another is recorded as the daughter of Yamana Sōzen who married into the Ōuchi line. These marriages were political instruments, tying the Yamana to rival and allied families alike.

Late in life he took Buddhist vows and adopted the name Sōzen, a common step for a warrior of his rank who wished to retire from active command while keeping his influence. He did not withdraw from politics. Instead he became the leading figure of one faction among the shogunal daimyō, and it was in that role that he entered the conflict that defined his final years.

The Ōnin War set Sōzen against Hosokawa Katsumoto. The fighting took place in Heian-kyō, the imperial capital, and reduced much of the city to ruins. Sōzen died in Kyoto on 15 April 1473, before the war reached its end.

Why They Matter

The Ōnin War is conventionally treated as the event that ended the stable order of the Muromachi shogunate and opened the century of civil war known as the Sengoku period. Sōzen was one of its two principal architects. By leading a coalition of daimyō against Hosokawa Katsumoto, he turned a dispute over shogunal succession and family inheritance into a nationwide conflict.

The war was fought inside the capital itself. Armies manoeuvred through the streets of Heian-kyō, and the destruction was severe enough that the city's recovery took generations. That a dispute between two lords could consume the capital and then the provinces showed how far the authority of the Ashikaga shoguns had decayed.

Sōzen's death in 1473 did not end the fighting. The conflict continued, and the pattern it established — regional lords building independent power while the central government weakened — shaped Japanese politics for the next hundred years. For readers of Japanese history, Sōzen is a hinge figure: a man whose career began in the relatively ordered world of the fifteenth-century shogunate and ended in the wars that replaced it.

The Name in Japanese

The name is written 山名宗全. It is read in kana as やまな そうぜん, and in romaji as Yamana Sōzen. The long vowel in Sōzen is written with a macron; without it, the name is often rendered as Sozen.

Breaking the name down character by character:

山 — read yama here. It means "mountain". This is one of the most common elements in Japanese surnames and place names.

名 — read na here. It means "name". Together, 山名 (Yamana) is the surname of the family, literally "mountain name". The Yamana were a branch of the Minamoto lineage that took its name from a place in what is now Hyōgo Prefecture.

宗 — read sō here. It means "doctrine", "sect", or "origin/ancestor". In warrior names of this period it frequently appears in the Buddhist names taken on ordination, which is exactly how it functions here.

全 — read zen here. It means "whole", "complete", or "entire". Combined with 宗, it forms the monastic name Sōzen.

The name is therefore a surname of two kanji followed by a two-kanji Buddhist name. This structure — family name plus a religious or adult name — is typical of Muromachi-period warriors who took vows. His earlier name, Yamana Mochitoyo (山名持豊), uses the same surname with a different given name; 持 (mochi) means "hold" or "possess", and 豊 (toyo) means "abundant" or "rich".

Legacy

Sōzen's historical reputation rests on the war he fought and the destruction it caused. In Japanese accounts of the Muromachi period he is paired with Hosokawa Katsumoto as one of the two men whose personal rivalry became a national catastrophe. The nickname Aka-nyūdō, "the Red Monk", has kept his memory vivid in popular retellings, giving a physical image to a figure otherwise known mainly for strategy and alliance-building.

His descendants and sons-in-law carried the Yamana name and its connections into the following decades. Through his daughter he was the grandfather of Ōuchi Masahiro, linking him to another of the great houses of western Japan. The marriages he arranged outlived him and continued to shape the alignments of the Sengoku period.

He died in Kyoto on 15 April 1473 and was buried in a city that his war had largely destroyed. The Ōnin War ground on after his death, and the political world it produced — one of competing regional warlords and a hollowed-out shogunate — is the world that Japanese history calls the Sengoku period. Sōzen stands at its beginning.