The Japanese castles of feudal Japan They are much more than just walls and towers that look good in photos. Behind every stone and every roof lie centuries of wars, pacts, betrayals, and samurai power. These fortresses were both military headquarters, noble residence and political centerand marked the birth of many of today's Japanese cities.
Walking through them today, one has the feeling of walking through a huge historical film set, but in reality you are treading the real stage where battles, alliances and changes of era were decidedFrom almost inaccessible mountain castles to elegant plains fortresses surrounded by moats, each tells a part of the story of the country and its legendary inhabitants. samurai y daimyo who governed them.
Origin and history of Japanese castles
Long before the spectacular skylines of Himeji or Osaka existed in Japan very humble defensive structuresDuring the Yayoi and Kofun periods (approx. 300 BC – 710 AD) villages were built protected by wooden palisades and earthen ditchesThey were not castles in the strict sense, but they were the direct ancestors of the great fortresses that followed.
With the formation of the Yamato state during the Nara and Heian periods (8th-12th centuries), politics became more complex and the need arose to defend the borders and strategic routesMore organized fortifications were then built, always based on wood and earth, to face enemies such as the emishi from the north or possible incursions from Korea, although we were still far from the stone castles we associate with classic feudal Japan.
The big leap came with the Kamakura period (1185-1333)When the samurai class became the true backbone of power, the first yamashiroMountain castles, designed primarily for defense, were literally embedded in hillsides and peaks. austere fortresses, designed to withstand sieges more than to show off.
During the Muromachi period (1333-1568), and particularly in the turbulent sengoku periodJapan became filled with castles. Each feudal lord (daimyoThey needed strongholds from which to control roads, rice fields, and cities. This led to a veritable military innovation careerThe better the castles, the more sophisticated the siege techniques became, which forced further improvements in defensive architecture.
In the final phase of the civil wars, the Azuchi-Momoyama period (1568-1600), castles underwent a conceptual shift: without losing their military role, they became authentic symbols of prestige and propagandaOda Nobunaga built Azuchi Castle, which is considered a model for many later fortresses, and Toyotomi Hideyoshi did the same with Fushimi-Momoyama Castle. From then on, the image of the grand castle with a spectacular main tower was forever etched in the Japanese collective memory.
With Tokugawa Ieyasu's victory at Sekigahara (1600) the Edo period (1600-1868)a period of prolonged internal peace. Many castles ceased to be war barracks and became primarily administrative capitals and courtly residencesThe shogunate passed the famous law in 1615 ikkoku ichijō reiwhich limited to one castle per province, forcing the dismantling of numerous fortresses to avoid dangerous concentrations of power.
The next major turning point came with the Meiji Restoration of 1868The new government, determined to modernize the country and leave behind the symbols of feudalism, ordered the demolition of many fortresses, while others were sold, abandoned, or repurposed. In the 20th century, these were further developed. World War II bombings, which razed iconic castles like the one in Hiroshima.
After the war, a new awareness of heritage emerged and began restoration and reconstruction campaignsInitially, the approach was to restore main towers with reinforced concrete, taking care of the exterior but sacrificing the fidelity of the interior, as seen in the case of the osaka castleMore recently, progress has been made towards more faithful historical reconstructions, based on old plans and traditional carpentry techniques, as in the Ōzu Castle (Shikoku).
Types of castles according to their location
One of the most curious aspects for the traveler is to see how the Japanese knew to make the most of the topographyThe location dictated everything: from the shape of the walls to daily life in the fortress. Broadly speaking, we can distinguish several classic typologies.
The yamashiroor mountain castlesThey stood atop peaks and ridges. They were installations almost impossible to assault, protected by steep slopes and zigzagging paths that exhausted the enemy. The drawback was clear: supply with provisions and ammunition Building a fortress at such a high altitude was a complicated undertaking. Bitchū Matsuyama Castle, one of the original twelve castles, is a spectacular example and also boasts being among the highest fortresses in the country.
In the middle ground are the hirayamajirocastles on hills above plainsThey were built on small rises that commanded the surrounding terrain, combining a certain defensive advantage with a much more comfortable relationship with the environment. They allowed control trade routes and agricultural areas and, at the same time, centralize local administration. Himeji Castle or Hikone Castle perfectly illustrate this model.
There were also the hirajiroplain castlesThese fortresses, very typical of the Edo period, reflect the shift from withstanding constant sieges to managing territories and centralizing the bureaucracy. Built on flat terrain, their defenses were based on... rings of moats, complex walls, and a clever layout of courtyards and gatesNijō Castle in Kyoto is a good example of this type.
Within the plains castles we find a very special subcategory: the mizujiroor water castlesThey were built taking advantage of the sea or large rivers as an active part of the defensive system and, incidentally, as a logistical channel. They functioned partly as fortified port and strongholdThere are only three clear examples: Takamatsu, Nakatsu, and Imabari.
How a Japanese castle is organized: courtyards and defenses
To truly understand a Japanese castle, it's helpful to imagine it as an onion, with concentric or chained defensive ringsThe overall design, the nawabariIt established the position of the courtyards, walls, moats, and main buildings. Each error in the layout It could mean a fatal weakness in case of siege.
The defensive enclosures were organized in kuruwa o maruThat is, courtyards or protective rings. In the center was the honmaru, the hard core of the castle, where the main tower stood (tenshu) and often the palace of the feudal lord. Next came the ni-no-maru (second circle) and the san-no-maru (third circle), which added defensive layers and space for auxiliary dependencies and high-ranking residences.
In wealthier estates, castles could extend even further with outer areas called sotoguruwa, where mostly merchants and artisans lived. These areas, although they looked like ordinary neighborhoods, were part of the global defensive strategysince any enemy army would have to cross or go around them, exposing themselves to attacks from the walls.
One of the key elements of the Japanese defense was the ditches, or horiThey could be made of water (mizubori) or dry (karaboriand surrounded by several rings of walls. Sometimes rivers or inlets were used as natural moats, which reinforced the strategic character of the enclave. The width of the moat was carefully ensured to far exceed the effective range of arrows and arquebusesmaking ranged attacks as difficult as possible.
stone walls, ishigakiThese are another unmistakable hallmark. Unlike in Europe, in Japan it was common to build walls of carefully carved and fitted blocks. without using a mortarThis provided a degree of elasticity, very useful in a country prone to earthquakes, and explains why many walls are still standing. Over the centuries, different styles of stonework developed, such as the ranzumi (apparently chaotic, with blocks of various sizes) or the nunozumi (more orderly, with almost regular rows).
Regarding the carving of stones, three main types can be distinguished: nozurazumi, with barely worked rocks and more fragile walls; uchikomihagi, in which corners and surfaces are cut away to fit better, filling gaps with small pieces; and kirikomihagiA true work of engineering, where each block is carved with millimeter precision to fit into a perfect puzzle and withstand both climbing and earthquakesSome masters, such as Tōdō Takatora, also introduced corner reinforcement techniques, such as the sangizumialternating long and short stones to create almost indestructible vertices.
On these stone bases extended the white plaster walls, or dobeiThese structures enclosed courtyards, crowned walls, and lined moats. Their interiors concealed complex wooden structures covered with layers of earth, clay, and plaster, designed to to withstand projectiles, fire and, later, bullet impactsThese walls are usually topped with tiles and pierced by numerous holes. same, embrasures of various shapes from which the defenders could fire under cover.
Gates and entrances: traps for the enemy
If one had to choose critical points in the defense of a Japanese castle, they would undoubtedly be the doors, or monBetween one courtyard and the other stood sturdy wooden gates reinforced with iron, supported by massive pillars. Each of these gates was designed to slow down, channel, and expose the enemy to a devastating fire from the walls.
A very characteristic type is the yaguramon, a gate crowned by a small tower (yagura) which functioned simultaneously as a firing and observation post. These were first-class, highly visible access points, typically used at key points along the perimeter or as an inner gate in double defensive complexes.
yakuimon They featured a single large roof that covered both the front pillars and the rear reinforcement pillars. Although visually elegant, from a military point of view they were cumbersome: the eaves were so wide that limited the field of vision They were used by those defending the gate and could even serve as cover for attacking troops. That's why they were gradually replaced by more practical models.
koraimon This evolution was evident. Instead of a single, immense roof, they had a main roof over the front pillars and smaller, independent side canopies for the rear supports. This design improved visibility and control of the immediate surroundings, which is why it became the favorite option for exterior doors of many strengths.
The pinnacle of defensive sophistication was the system of masugata-monAn L-shaped complex consisting of two gates at right angles and a square or rectangular inner courtyard. An attacker who managed to breach the first gate was forced to stop and turn To face the second attack, they were crammed into a small space and completely surrounded by gun ports and turrets. This arrangement turned the entrance into a veritable trap.
In addition to these main models, there were simpler variants, such as the munamon (without additional reinforcing pillars), the peculiar tonashimon without gates, or the ceremonial ones kabukimonBasically, a lintel without a roof or any real defensive function. In terms of decoration, they shine... karamon, richly ornamented doors with typical curved roofs karahafu, such as the famous entrance to Nijō Castle in Kyoto.
The main tower or tenshu: power on high
The most recognizable element of any Japanese castle is the keep, tenshu o tenshukakuVisible from all over the city, it served as the emblem of the feudal lord and a constant reminder of who ruled there. Although often assumed to be the military heart of the city, in reality its The strictly defensive role was minor. than that of walls, moats and gates.
The first towers of this type date back to the second half of the 16th century, with Azuchi as an emblematic example. Architecturally, it was a wooden structures set on high stone walls, from three to five stories (or more, if we count the hidden internal levels) covered in white plaster and crowned by a complex succession of overlapping roofs.
The interior of the tenshu The originals surprise many modern visitors: far from the movies, they are spaces bare, functional and full of steep wooden staircasesClimbing with a backpack or with children can be quite an adventure, but the reward usually comes on the top floor, with viewpoints that offer panoramic views of the castle and the city that grew up at its feet.
In terms of aesthetics, roofs of this type are abundant. irimoyawith gables and multiple eaves, dormer windows chidori-hafu and decorative finials. Figures of shachihokomythical creatures with the body of a fish and the head of a tiger, to which was attributed the ability to summon rain, turning them into amulets against fire in structures basically made of wood.
Not all castles had or retained their main tower. Important fortresses like Sendai never had one. tenshu monumental, and others, such as Kanazawa, Nijō or Edo Castle itself (now the Imperial Palace of Tokyo), lost it due to fires or earthquakes and They never rebuilt it, as it is no longer considered essential from a practical point of view.
Tenshu variants and tower configurations
Over time, the main towers evolved into two major formal families. borogataThe older ones stood on irregular bases topped by a hipped roof with gables irimoyaA smaller upper body was superimposed on that volume, giving the impression that it had been added on. an observation tower on top of a previous buildingExamples of this style can be seen in castles such as Aya or Inuyama.
sotogata They represent the most regular and "modern" form. They were built on almost square foundations, and each level repeated the plan of the previous one, slightly reduced. The result is towers of stepped profile, very harmonious and easy to build, without large roofs of the type irimoya intermediate, although with an abundance of small decorative gables. Himeji or Matsumoto are famous prototypes of this type.
If we talk about how the main tower relates to the rest of the structures, we find several configurations. In castles of the style dokuritsushiki, the tenshu It stands in isolation, not physically joined to other towers. Hirosaki Castle, along with fortresses like Gifu or Maruoka, clearly demonstrates this volumetric independence.
In the model fukugoshikiThe main tower connects directly to a yagura smaller, which often acts as a high entrance. This creates compact but visually very dynamic ensembles, as seen in Hikone, Matsue, or Odawara.
For their part, the castles renketsushiki link the tenshu and other towers by way of watari yagurasingle-level covered galleries that allow move troops to cover between different defensive points. Nagoya or Kokura are good examples. And at the more complex end we have the configurations renritsushikiwhere the main tower is integrated into a ring of towers and galleries that practically encloses the honmaru, as in Himeji or Matsuyama, creating a brutally fortified core.
Some castles combine several of these solutions in a single structure. Matsumoto, for example, achieves a hybrid effect with direct connections and covered passageways to auxiliary towers, demonstrating the extent to which these solutions can be applied. Feudal architects played with spatial possibilities.
Yagura, warehouses and watchtowers
In addition to the great main tower, many castles featured a string of yagurasmall multi-story towers which served simultaneously as warehouses, observation posts, and firing batteries. The original name refers to their function as an "arrow storehouse," but over time they also housed gunpowder, food, and all kinds of strategic supplies.
At the corners of the walls appeared the sumiyaguraAngle towers with a privileged field of vision, capable of crossing fires along two sections of wall and thus protecting the naturally most vulnerable points of the perimeter.
The first yagura They were very simple, of the type seiroyaguraBasically, an elevated scaffolding of beams. Later, the same styles were applied. borogata y sotogata that in tenshu, although the style of watchtowers borogata They have been preserved in very small numbers.
Most yagura preserved today are from Two levelsAlthough there are also three-story towers, the so-called gosankai yagurawhich in some castles in eastern Japan functioned de facto as the main tower. In fact, the supposed "keep towers" of Hirosaki or Marugame are technically yagura three floors.
We must not forget the hirayaguraSingle-story towers, too low to serve as large watchtowers but very useful as defensive modules at the ends of walls or as connecting pieces. Closely related are the tamon yaguraLonger versions that extend along the walls, offering wide lines of fire over ditches and entrances. These can be confused with the watari yagurawhich are essentially covered walkways that link structures, but in the tamon yagura Defensive functionality takes precedence over that of a simple runner.
Palaces, rooftops and decoration
One of the biggest surprises for many visitors is discovering that the daimyo did not live in the main towerbut in large palaces of one or a few stories called gotenThese complexes, much more comfortable and luxuriously decorated, housed reception rooms, private residences, and administrative offices.
Based on their location, these palaces could be classified into honmaru goten (in the central enclosure, next to the tower), ni-no-maru goten (on the second ring) or otoshi goten (smaller palaces in outlying areas). The honmaru goten The Nagoya castle, rebuilt using traditional techniques, is a wonderful way to get an idea of how a feudal elite lived and ruledAlso of great value is the Kawagoe Palace, the only remaining vestige of its former castle.
If we talk about palaces within Japanese castles, it is essential to mention the Nijō Castle, in KyotoHis palace of ninomaruThe original, it is famous for its "nightingale" floors, planks that intentionally creak to betray the presence of intruders, and for its mural paintings. The palace of honmaru, moved there from the Imperial Palace, completes a set that sums up, like few others, the courtly life at the end of the feudal era.
Architecturally, Japanese castles also stand out for their roofs of the type irimoyaThese buildings combine hipped roofs with gables on two opposite sides. This system, inherited from China, offered great structural stability against the elements and allowed for effective interior ventilation. Decorated tiles abound on the roofs. onigawara (often with demonic motives to ward off evil) and the shibi, final touches that in many castles take the form of shachihoko.
These hybrid creatures, half fish, half tiger, became authentic visual iconsBeyond their apotropaic function (protecting against fires), they reveal the status of the castle: the larger and more elaborate they are, the greater the wealth and ambition of the lord who ordered them placed, as can be seen in the famous shachihoko golden ones of Nagoya Castle.
Castles to see in Japan: original, reconstructed and ruins
It is currently estimated that there are slightly more than one hundred castles open to visitorsAlthough several thousand were built during the Sengoku period, only twelve retain their original wooden main tower; the rest are reconstructions from different eras or simply ruins with remains of walls and towers.
Called "12 original castles" They are absolute gems for anyone seeking the most authentic experience possible: steep staircases, wooden floors, centuries-old beams, and views that samurai knew 400 years ago. Among them, the following stand out: Himeji (the "White Heron", probably the most spectacular and best preserved), Matsumoto (the "Crow's Castle", with its black walls and views of the Japanese Alps), hirosaki (famous for the sea of cherry blossoms that surrounds it in spring), hikone, Inuyama, Matsuyama, Marugame o Uwajima, among others.
Beyond these twelve, many castles have been rebuilt in concrete throughout the 20th century. Although from a purist's point of view they may lose their charm, they often house very educational museums about local history and feudal wars, with armor, swords, models, and interactive resources. Osaka Castle is the prime example: a modern structure with an elevator, but a faithful exterior and a spectacular park where you can enjoy plum and cherry blossoms.
Other cases, such as Kumamoto, Hiroshima, Odawara, Aizu-Wakamatsu, Okayama, kokura o ShimabaraThey combine original parts (walls, secondary towers, moats) with main towers rebuilt which allow one to get a fairly accurate idea of its former splendor. Shuri Castle, in Okinawa, is a separate chapter due to its clear influence from the ancient Ryukyu Kingdom and its tragic history of destruction and reconstruction.
In recent decades, a trend towards rigorous historical reconstructionsFollowing old plans and traditional carpentry techniques, as was done at Ōzu Castle or in the restoration of various towers and storerooms at Kanazawa Castle and Kakegawa Castle, these projects avoid exposed concrete and strive for the utmost care in material and formal fidelity.
There is also a very interesting chapter dedicated to the castle ruins, or jōsekiIn many cases, only walls, moats, and some other structures remain. yaguraBut the site has been converted into a public park. This is what has happened with the ruins of Azuchi, Takeda (the famous "castle in the sky", which appears to float above a sea of clouds), Naegi, Fukuoka, Hagi, the park of the old Aoba Castle in Sendai or, in the heart of Tokyo, the remains of Edo Castle integrated into the gardens of the current Imperial Palace.
Castles, cities and everyday life
Almost all the great feudal castles gave rise to a jōkamachicastle city, which grew close to its moats and walls. The highest-ranking samurai resided in the vicinity of the honmaruwhile those of lower status were located further out. Even further away were the neighborhoods of merchants and artisans, and on the periphery lay... temples, sanctuaries and leisure districts.
This is how cities that are so familiar to us today were organized. Tokyo (Edo), Kanazawa, Nagoya o KumamotoThe castle acted as political, economic and symbolic center of the surrounding territory: from there taxes were administered, hydraulic works were regulated, war was declared or peace treaties were sealed.
Plain and hill castles facilitated a relatively easy flow of goods, thanks to navigable rivers, nearby ports, or good roads. For this reason, many lords maintained a dual system of fortresses: mountain castles as extreme refuge in times of war, and plain castles as the usual seat of government and commerce in calmer times.
Castle collecting and tourism in Japan
Today, visiting castles has become a a very popular hobby among the JapaneseIt's practically a national sport. There's a whole system of official lists like "the 100 best castles" or "the new 100 castles," which encourages travelers to tick fortresses off the map and discover less touristy corners of the country.
A very common way to experience this hobby is collect castle stampsIn many fortresses, you'll find an exclusive rubber stamp that you can use in a special notebook. There are books designed to collect stamps from 24, 100, or 200 of the most prominent castles, and many enthusiasts make repeat visits just to get the stamp they're missing.
Another form of collecting is that of gojōincastle calligraphy, a direct parallel with the goshuin which are collected in temples and sanctuaries. In some castles, for a small fee, a calligrapher will trace in your notebook (gojōin-chō) the name of the castle and some associated motif, creating a a unique and very personal memory of the visit.
For the foreign traveler, many castles are also excellent vantage points for observing local daily life: families strolling, students on excursions, couples enjoying the hanami under the cherry trees or of kōyō in autumn. And thanks to the Japan Rail Pass and the extensive rail network, it's relatively easy to connect. several fortresses on the same routecombining history, landscape and local gastronomy.
Japanese castles are much more than pretty picturesque images: they encapsulate centuries of feudal warfare, aesthetic refinement, and resilience against time, and exploring their walls, courtyards, and halls is one of the most intense ways to experience Japan. connect with the past from the land of the rising sun.
