JSON

Japanese Castle Types - JSON

Japanese castles are classified by terrain into hirajō (flatland castles), yamajirō (mountain castles), hirayamajirō (hilltop castles), mizujirō (water castles), and kojō (lake castles). Each type was built according to historical context and strategic purposes, with different balances between defensive capabilities and convenience. While mountain castles emphasizing defense were mainstream during the Sengoku period, flatland and hilltop castles developed as political and economic centers in the early modern period.

Japanese castles castle architecture history Sengoku period Edo period architecture

[
  {
    "code": "1",
    "slug": "hirajo",
    "name": "Flatland Castle (Hirajō)",
    "description": "Castles built on flat land, functioning as political and economic centers.",
    "examples": "Matsumoto Castle, Nagoya Castle, Hiroshima Castle, Nijō Castle, Yamagata Castle",
    "era": "Early Modern Period (Edo Period)",
    "defense": "Reinforced by water moats",
    "convenience": "High"
  },
  {
    "code": "2",
    "slug": "yamajiro",
    "name": "Mountain Castle (Yamajirō)",
    "description": "Castles built in mountainous terrain with solid defenses utilizing natural topography.",
    "examples": "Kasugayama Castle, Bitchū Matsuyama Castle (Castle in the Sky), Gifu Castle, Iwamura Castle, Takanori Castle, Odani Castle",
    "era": "Medieval Period (Nanboku-chō to Sengoku)",
    "defense": "Extremely high (utilizing natural terrain)",
    "convenience": "Low"
  },
  {
    "code": "3",
    "slug": "hirayamajiro",
    "name": "Hilltop Castle (Hirayamajirō)",
    "description": "Castles built on hills or low mountains in plains, combining advantages of both flatland and mountain castles.",
    "examples": "Himeji Castle, Matsuyama Castle, Tsuyama Castle, Osaka Castle, Sendai Castle, Kumamoto Castle, Edo Castle, Marugame Castle, Azuchi Castle",
    "era": "Late Sengoku to Edo Period",
    "defense": "High (stone walls + terrain utilization)",
    "convenience": "Moderate"
  },
  {
    "code": "4",
    "slug": "mizujiro",
    "name": "Water Castle (Mizujirō)",
    "description": "Castles built facing the sea, utilizing seawater in their moats.",
    "examples": "Takamatsu Castle (Japan's largest water castle), Imabari Castle, Nakatsu Castle",
    "era": "Sengoku to Edo Period",
    "defense": "Strong against maritime attacks",
    "convenience": "Maritime transportation hub"
  },
  {
    "code": "5",
    "slug": "kojou",
    "name": "Lake Castle (Kojō)",
    "description": "Castles built surrounding lakes or marshlands.",
    "examples": "Matsue Castle (National Treasure), Zeze Castle",
    "era": "Sengoku to Edo Period",
    "defense": "Natural defense using water",
    "convenience": "Water transport hub"
  }
]