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 "Rocks in my path? I keep them all. With them I shall build my castle."
– Nemo Nox
 "If you see a castle under fog, you must walk there to meet the extraordinary dreams."
– Mehmet Murat Ildan

Castles is a Medieval Era technology in Civilization VI. It can be hurried by adopting any government with 6 policy slots.


The castle is the signature building of the Medieval Age - strong, hard, unyielding, unwavering. It elevates city defenses to a new level (known as Medieval Walls),but in fact it does more than this - it marks the peak of medieval thinking, with its notion that the ways of the past are the best, and need to be kept at all costs. Of course, the future will soon prove this notion wrong.

Castles is a surprisingly useful military tech: in defensive plan, it unlocks the next-gen Walls, and in offensive plan - a new, better light cavalry unit. Finally, it unlocks the first Wonder which adds a Policy Card slot in any government - which is one of the best bonuses in the game! Granted, it's a Military slot, but the strategic diversity of Military cards ensures that even non-militaristic civilizations can always find some use for an extra Military slot.

The tech is relatively easy to beeline, once you hit Construction in the Classical Era. This makes Castles often the first Medieval tech to be researched.

Civilopedia entry[]

Great piles of stone – some still intact (more or less) – dominate the varied landscapes of Europe, castles dating back to the early 10th Century AD when feudal lords sought to insure their power and influence. Some were little more than cold, dirty square stone boxes; others were fairy structures with tall towers, crenelated parapets and flying buttresses. But rather than the romantic visions of noble knights, damsels in distress, great feasts and throwing the barbarians back from the moat, castles served the ultimate utilitarian role in feudal society – imposing the lord's will on the land.

According to archeologists, the accumulation of surplus wealth and resources led to the need for defensive structures, and the earliest fortifications evolved in the Fertile Crescent, Indus Valley, Egypt and China to keep the barbarians out of the larder. Europe was rather slower to develop such fortresses, and it was not until the Bronze Age that hill forts began to be built. Soon after the collapse of the Pax Romana, Germanic tribes began to construct heavy stone fortifications. The incursions of the Magyars, Vikings and Muslims brought more castle-building, and the breakdown of the Carolingian Empire led to the privatization of local government as local lords assumed the “privilege” of protecting the people. The success of William the Conqueror set off a lengthy period of warfare and conquest by contending kings, dominated by castle building throughout western civilization ... until gunpowder and cannon showed up in the 1600s.

Just as the thick- and high-walled castles fell out of vogue in Europe, Japan entered its own castle age. Evolving from the wooden stockades of the early daimyo, the first castles were constructed of stone with wooden upper structures. Thus, they tended to burn a lot – especially during the Sengoku (“Warring States”) period. Unlike in Europe, the introduction of gunpowder spurred the building of Japanese castles, and the 16th Century saw a boom in castle-building on a grander scale than ever until the Meiji Restoration and the end of feudalism there.

Civilization VI Technologies [edit]
Ancient Animal HusbandryArcheryAstrologyBronze WorkingIrrigationMasonryMiningPotterySailingWheelWriting
Classical Celestial NavigationConstructionCurrencyEngineeringHorseback RidingIron WorkingMathematicsShipbuilding
Medieval ApprenticeshipButtress GS-Only.pngCastlesEducationMachineryMilitary EngineeringMilitary TacticsStirrups
Renaissance AstronomyBankingCartographyGunpowderMass ProductionMetal CastingPrintingSiege TacticsSquare Rigging
Industrial BallisticsEconomicsIndustrializationMilitary ScienceRiflingSanitationScientific TheorySteam Power
Modern ChemistryCombustionElectricityFlightRadioRefining GS-Only.pngReplaceable PartsSteel
Atomic Advanced BallisticsAdvanced FlightCombined ArmsComputersNuclear FissionPlasticsRocketrySynthetic Materials
Information CompositesGuidance SystemsLasersNanotechnologyNuclear FusionRoboticsSatellitesStealth TechnologyTelecommunications
Future GS-Only.png Advanced AIAdvanced Power CellsCyberneticsFuture Tech*Offworld MissionPredictive SystemsSeasteadsSmart Materials
* Future Tech is an Information Era technology until the Gathering Storm expansion.