
Sōhei (僧兵; "monk soldiers", "warrior monks"[1]) wereBuddhistwarrior monks of bothclassical andfeudal Japan. At certain points in history, they held considerable power, obliging theimperial andmilitary governments to collaborate.
The prominence of thesōhei rose in parallel with the ascendancy of theTendai school's influence between the 10th and 17th centuries. The warriors protected land and intimidated rival schools of Buddhism, becoming a significant factor in the spread of Buddhism and the development of different schools during theKamakura period.[2]
Thesōhei shared many similarities with the Europeanlay brothers, members of amonastic order who might not have been ordained. Much like theTeutonic Order, the warrior monks of theHoly Roman Empire, and thecrusading orders,sōhei did not operate as individuals, or even as members of small, individual temples, but rather as warriors in a large extended brotherhood or monastic order. The hometemple of asōhei monastic order might have had several, if not dozens or a hundred, smallermonasteries, training halls, and subordinate temples connected to it. A famoussōhei monastery isEnryaku-ji onMount Hiei, just outsideKyoto, whileKōfuku-ji inNara also fielded a largesōhei army.
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Warrior monks first appeared during theHeian period,[3] when bitter political feuds began between different temples, different subsects ofBuddhism, over imperial appointments to the top temple positions in thesōkan system (zasu orBuddhist abbot). Much of the fighting over the next four centuries was over these sorts of political feuds, and centered around the temples ofKyoto,Nara, andŌmi, namely theTōdai-ji,Kōfuku-ji,Enryaku-ji, andMii-dera, the four largest temples in the country.
The first armed conflict broke out in 949, when 56 monks from Tōdai-ji staged a protest at the residence of a Kyoto official, over an appointment that displeased them. Protests of this sort continued through the 10th century, often breaking out into brawls in which some participants would be killed. In 970, following a dispute between Enryaku-ji and theYasaka Shrine of Kyoto, the former established the first standing army of warrior monks. It is not entirely clear whether this standing army consisted of monks from Enryaku-ji or was more like a mercenary army, sinceRyōgen, the abbot who established this army, also established a code of monastic conduct that prevented monks from leaving Mount Hiei during their twelve-year training, from covering their faces, and from carrying weapons.
Beginning in 981, there were a number of armed conflicts between Enryaku-ji and Mii-dera, each the head temple of a different sub-sect ofTendai. These disputes were, as before, over political appointments and dishonorable etiquette. More often than not, these were cases of members of one faction being chosen as the abbot of the other faction's temple, and the monks would protest. This continued, on and off, once stopping for as long as 40 years, through the 11th and into the 12th century. The armies became larger and the violence increased, until in 1121 and 1141 Mii-dera was burned to the ground by monks from Enryaku-ji. Other temples became embroiled in the conflicts as well, and Enryaku-ji and Mii-dera united against Kōfuku-ji, and, another time, againstKiyomizu-dera.
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At the end of the 12th century, Japan was plunged into theGenpei War and, while the feuds between the temples did not end, they became subsumed by larger events. The warringMinamoto andTaira clans both tried to obtain the aid of the warrior monks of Nara and Kyoto, adding the temples' forces to the clans' already mighty armies ofsamurai.
Taira no Kiyomori sent generous gifts of rice and silk to Enryaku-ji, ensuring they would not help his enemies, the Minamoto, who had allied themselves with the monks of Mii-dera. In theBattle of Uji in 1180, one of the more famous battles in whichsōhei participated, the monks of Mii-dera, along with a force of Minamoto samurai, tried to defend the bridge over theUji River, and theByōdō-in, a temple behind it, from an attacking Taira force. The monks pulled up the planks of the bridge to impair the ability of the horse mounted samurai to cross. The warrior monks stood their ground with bow and arrow,naginata, sword and dagger, but were ultimately defeated. Following his victory, Taira no Kiyomori ordered that revenge be taken upon the monks that opposed him. Mii-dera was burned to the ground once again, as were many of the temples of Nara. Only the Enryaku-ji escaped unscathed.
Three years later, whenMinamoto no Yoshinaka betrayed his clan by storming into Kyoto, setting theHōjōji Palace aflame and kidnappingEmperor Go-Shirakawa, he was opposed by many of the monks of Kyoto, including those from Mount Hiei.
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Following the Genpei War, the monasteries, to a large extent, turned their attention to rebuilding, first physically, and then politically. Their political influence grew stronger through peaceful means, and the warrior monks played only very minor roles in the wars of the 13th and 14th centuries. Violent conflict between the temples still occurred on occasion, once again over political and spiritual appointments, and related matters.
During the wars of theNanboku-chō period,Mount Hiei took in the rebelEmperor Go-Daigo, and offered him sanctuary. Emperor Go-Daigo, along with his son, and the help of thesōhei of Mount Hiei, launched a brief rebellion against theKamakura shogunate. TheAshikaga shogunate took power shortly afterwards, and supportedZen over the otherBuddhist sects, drawing the ire of the warrior monks. Over the course of the 1340s–1360s a number of conflicts erupted between theTendai sect temples, and those of Zen, especiallyNanzen-ji.
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TheŌnin War, starting in 1467, was the prelude to over a century of civil war inJapan, and the stimulus for a reorganization of the warrior monks. Unlike theJōkyū War andMongol invasions of the 13th century, the Ōnin War was fought primarily in Kyoto, and thus the warrior monks could no longer remain non-violent and neutral.
In addition, a new breed of warrior monks was forming in the countryside. Where the monks of Mount Hiei had subscribed to the teachings of the Tendai sect, these new groups, calling themselvesIkkō-ikki, followed the dictates of theJōdo Shinshū sect of beliefs. They were essentially coalitions of religious fundamentalist priests, farmers, and families, who were willing to literally fight for their beliefs.Ikkō-ikki translates to something like "devoted league", but also had the connotation of "single-minded riots". In 1488, their leaderRennyo, incited an uprising against samurai rule, and securedKaga Province for the Ikkō-ikki. From there they spread, establishing themselves inNagashima,Ishiyama Hongan-ji, andMikawa Province. Their growing power base was eventually to attract the attention of warlords likeOda Nobunaga andTokugawa Ieyasu, who recognized their opposition to samurai rule, their determination, their strength, and their numbers.

Tokugawa Ieyasu attacked the Ikkō-ikki of Mikawa in 1564, in theBattle of Azukizaka, and failed to defeat the Ikkō-ikki, but returned shortly afterwards with a contingent of warrior monks from his own religious sect,Jōdo-shū, and, after defeating the Ikkō adherents in battle, burned all their temples to the ground. As Oda Nobunaga rose to power at the end of the 1560s, the monks of Enryaku-ji regained their military might, and fought a number of skirmishes in the streets of Kyoto against a new rival sect,Nichiren Buddhism. They eventually burned all of Kyoto's Nichiren temples to the ground, and then sought allies among the local lords (daimyō). Unfortunately for them, theAzai andAsakura clans they allied with were enemies of Oda Nobunaga. Beginning on September 29, 1571, Nobunaga's army of 30,000 led theSiege of Mount Hiei, destroying Enryaku-ji and massacring thousands. Though it was rebuilt, the standing army of warrior monks would never be reconstituted after this devastation.
Nobunaga then moved on to fighting the Ikkō-ikki in their fortresses of Nagashima and Ishiyama Hongan-ji (seeSieges of Nagashima,Ishiyama Hongan-ji War). In the summer of 1574, with the help of former pirateKuki Yoshitaka, Nobunaga essentially blockaded the Ikkō fortresses and starved them into submission. The 20,000 inhabitants of the fortress went up in flames along with their home. Two years later, Nobunaga returned to the Ishiyama Hongan-ji, which he had failed to take earlier. At the twoBattles of Kizugawaguchi, Nobunaga defeated his enemies, theMōri clan, who had naval control over the area. The Ikkō were finally forced to surrender in 1580.
In the 1580s and 1590s, various factions of warrior monks sided with either Tokugawa Ieyasu or his rivalToyotomi Hideyoshi, fighting in a number of battles and skirmishes. When Tokugawa Ieyasu finally defeated the last of his enemies and took control of the country in 1603, the time of the warrior monks finally came to an end.
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Sōhei were quite varied in their armament. Thenaginata is the weapon most often associated with them, though in legend as well as history many warrior monks are known to have been proficient with everything fromyari,yumi,tachi, andtantō. Many fought on horseback, and many with theō-yoroi armor of the samurai.
Warrior monks, like most other Buddhist monks of related sects, wore a series ofkimono-like robes in layers, one over the other, usually white underneath, and tan or saffron yellow on top; this style has changed very little since the introduction of Buddhism to Japan in the 7th century. Footwear traditionally consisted oftabi socks andgeta (wooden clogs), orwaraji (straw sandals). Warrior monks would often fold and tie the white headcowl to cover more of their head, or would substitute ahachimaki headband. Finally, many warrior monks would wear some form of samurai armor.
Thesōhei employed a variety of weapons. Theobi, or belt, of the kimono would often be supplemented with a heavier sash, so a sword could be slung from it. The longtachi was probably the most common sword, though many monks may have carriedtantō as well. Many monks were also accomplished archers, and usedbamboo-and-rattan bows, calleddaikyū, with bamboo arrows. The most traditional weapon of the monk, however, was thenaginata, a weapon much like the Chineseguandao orpodao, Europeanglaive or the Russiansovnya. Thesōhei were also trained to use the heavykanabō, large clubs of studded wood or iron.
The Ikkō-ikki monks of the 16th century, due largely to their origins as countryside mobs, were far more varied in their armor and armament. Many wore the more traditional monk robes, with varying degrees and types of armor. Many wore various sorts of helmets, while many others opted for the straw hat and cloak of a peasant.Naginata remained very common, along with a variety of swords and daggers, and a limited number ofarquebuses (with theSaika Ikki being a notable exception, as they are mainly composed of musketeers and gunsmiths as perSuzuki Magoichi's standard of having an all-musketeer army). Finally, while not truly armor nor armament, a very common item wielded by the mobs of Ikkō-ikki monk warriors was a banner with a Buddhist slogan written upon it. One of the more common slogans was thenenbutsu, "HailAmitābha!" (Namu Amida Butsu).
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