Aoe4
DatabaseDynamicsStatsPatchesTools
  • Units
      Workers
    • VillagerVillager
    • TraderTrader
    • MonkMonk
      • Infantry
    • LimitaneiLimitanei
    • ArcherArcher
    • CrossbowmanCrossbowman
    • Varangian GuardVarangian Guard
    • HandcannoneerHandcannoneer
      • Cavalry
    • ScoutScout
    • HorsemanHorseman
    • CataphractCataphract
      • Siege
    • Siege TowerSiege Tower
    • SpringaldSpringald
    • MangonelMangonel
    • Counterweight TrebuchetCounterweight Trebuchet
    • CheirosiphonCheirosiphon
    • BombardBombard
      • Ships
    • Fishing BoatFishing Boat
    • Demolition ShipDemolition Ship
    • Trade ShipTrade Ship
    • GalleyGalley
    • Transport ShipTransport Ship
    • DromonDromon
    • CarrackCarrack
      • Mercenaries
    • Zhuge NuZhuge Nu
    • Musofadi WarriorMusofadi Warrior
    • LongbowmanLongbowman
    • ArbalétrierArbalétrier
    • Horse ArcherHorse Archer
    • Javelin ThrowerJavelin Thrower
    • GhulamGhulam
    • MangudaiMangudai
    • SipahiSipahi
    • LandsknechtLandsknecht
    • Desert RaiderDesert Raider
    • KeshikKeshik
    • Camel ArcherCamel Archer
    • Royal KnightRoyal Knight
    • Camel RiderCamel Rider
    • StreltsyStreltsy
    • GrenadierGrenadier
    • Nest of BeesNest of Bees
    • War ElephantWar Elephant
    • CannonCannon
    • Royal CannonRoyal Cannon
    • Huihui PaoHuihui Pao
    • Tower ElephantTower Elephant
  • Buildings
      Landmarks
    • Capital Town CenterCapital Town Center
    • Grand WineryGrand Winery
    • Imperial HippodromeImperial Hippodrome
    • Cistern of the First HillCistern of the First Hill
    • Golden Horn TowerGolden Horn Tower
    • Foreign Engineering CompanyForeign Engineering Company
    • Palatine SchoolPalatine School
      • Economy
    • Olive GroveOlive Grove
    • AqueductAqueduct
    • HouseHouse
    • Lumber CampLumber Camp
    • Mining CampMining Camp
    • MillMill
    • PalisadePalisade
    • Palisade GatePalisade Gate
    • BarracksBarracks
    • CisternCistern
    • DockDock
    • Town CenterTown Center
    • MarketMarket
    • Archery RangeArchery Range
    • StableStable
    • BlacksmithBlacksmith
    • Mercenary HouseMercenary House
    • Stone WallStone Wall
    • Stone Wall GateStone Wall Gate
    • Siege WorkshopSiege Workshop
    • MonasteryMonastery
    • UniversityUniversity
      • Military
    • OutpostOutpost
    • Stone Wall TowerStone Wall Tower
    • KeepKeep
      • Wonders
    • Cathedral of Divine WisdomCathedral of Divine Wisdom
  • Technologies
      Units
    • ForestryForestry
    • Survival TechniquesSurvival Techniques
    • WheelbarrowWheelbarrow
    • Eastern Mercenary ContractEastern Mercenary Contract
    • Silk Road Mercenary ContractSilk Road Mercenary Contract
    • Western Mercenary ContractWestern Mercenary Contract
    • Extended LinesExtended Lines
    • TextilesTextiles
    • Fitted LeatherworkFitted Leatherwork
    • Iron UndermeshIron Undermesh
    • Naval ArrowslitsNaval Arrowslits
    • Specialized PickSpecialized Pick
    • Steeled ArrowSteeled Arrow
    • Double BroadaxDouble Broadax
    • Siege EngineeringSiege Engineering
    • ArrowslitsArrowslits
    • BloomeryBloomery
    • Fortify OutpostFortify Outpost
    • Professional ScoutsProfessional Scouts
    • HorticultureHorticulture
    • Border SettlementsBorder Settlements
    • ExpilatoresExpilatores
    • TrapezitesTrapezites
    • Armored HullArmored Hull
    • Drift NetsDrift Nets
    • Extra HammocksExtra Hammocks
    • Balanced ProjectilesBalanced Projectiles
    • Greased AxlesGreased Axles
    • Insulated HelmInsulated Helm
    • Shaft MiningShaft Mining
    • Wedge RivetsWedge Rivets
    • Herbal MedicineHerbal Medicine
    • Lumber PreservationLumber Preservation
    • Military AcademyMilitary Academy
    • DecarbonizationDecarbonization
    • Boiling OilBoiling Oil
    • FertilizationFertilization
    • Heavy DromonHeavy Dromon
    • Liquid ExplosivesLiquid Explosives
    • Mangonel EmplacementMangonel Emplacement
    • Teardrop ShieldsTeardrop Shields
    • Veteran ContractVeteran Contract
    • ExplosivesExplosives
    • Heated ShotHeated Shot
    • Lightweight BeamsLightweight Beams
    • ShipwrightsShipwrights
    • SpyglassSpyglass
    • Angled SurfacesAngled Surfaces
    • Court ArchitectsCourt Architects
    • CupellationCupellation
    • Master SmithsMaster Smiths
    • PietyPiety
    • Platecutter PointPlatecutter Point
    • Siege WorksSiege Works
    • Cannon EmplacementCannon Emplacement
    • ChemistryChemistry
    • Crosscut SawCrosscut Saw
    • Incendiary ArrowsIncendiary Arrows
    • Roller Shutter TriggersRoller Shutter Triggers
    • Silk BowstringsSilk Bowstrings
    • Tithe BarnsTithe Barns
    • Adjustable CrossbarsAdjustable Crossbars
    • Damascus SteelDamascus Steel
    • BiologyBiology
    • Elite Army TacticsElite Army Tactics
    • Precision Cross-BreedingPrecision Cross-Breeding
    • Serpentine PowderSerpentine Powder
    • Greek Fire ProjectilesGreek Fire Projectiles
    • Elite ContractElite Contract
    • Ferocious SpeedFerocious Speed
    • NumeriNumeri
  1. Home
  2. Byzantines
  3. Buildings
  4. Keep
Keep

Defensive Building

Keep

Byzantines

Byzantines

Heavy garrison and defensible position. Can be upgraded with weaponry. Adds additional attacks while garrisoned.

Patch History

2026-06-01 Patch 16.2.10604

Medical Centers

  • Moved to the Keep.

2026-04-30 Update 16.1.9737

General Changes & Bugfixes

  • Relics will now Keep track of their cooldown when placed in a Monastery instead of refreshing.

Design Update/Rework

  • (Previously would Keep a stock of 5 wolves around the Den replacing them as they died, now produces 5 then stops)

2024-11-19 Patch 12.1.2454

Balance & Gameplay Changes (All Civilizations)

  • Keeps and Keep Landmarks fire armor increased from 5 → 6

2024-01-30 Patch 9.2.628

Companion Equipment (Castle Age)

  • Moved from the Keep to the Blacksmith.

Abilities and influences

  • Conscriptio

    Conscriptio

    Military unit production rate increased +20%/+40%/+60%/+80%/+100% by Water Level while within the influence of a Cistern. Toggle on CisternCistern or Cistern of the First HillCistern of the First Hill.

  • Dialecticus

    Dialecticus

    Research rate increased +30%/+60%/+90%/+120%/+150% by Water Level while within the influence of a Cistern. Toggle on CisternCistern or Cistern of the First HillCistern of the First Hill.

  • Praesidium

    Praesidium

    Building damage taken decreased by -5%/-10%/-15%/-20%/-25% by Water Level while within the influence of a Cistern. Toggle on CisternCistern or Cistern of the First HillCistern of the First Hill.

Produces

-

Researches

-
Costs
900stone
180time
garrison

15

Hitpoints 6500
Base: +5000
Court Architects: +1500
Ranged Attack 14
Base: +12
Incendiary Arrows: +2
Naval, Unit: +10
Ranged Armor 50
Base: +50
Fire Armor 6
Base: +6

Attack Speed

0.5S

Max Range

8.00TILES

Line of Sight

9.11TILES

Technologies

Boiling Oil

Boiling Oil

III

Defensive Technology

Towers and Keeps gain a boiling oil attack against nearby units that deals 30 damage.

500gold
200stone
90time
Mangonel Emplacement

Mangonel Emplacement

III

Weapon Emplacement

[特有] Add a defensive mangonel emplacement to this structure.

75gold
200stone
30time
Cannon Emplacement

Cannon Emplacement

IV

Weapon Emplacement

Add a defensive cannon emplacement to this structure.

125gold
375stone
60time
Court Architects

Court Architects

IV

Building Technology

Patronage of the finest builders increases all building health by +30%.

700gold
300stone
90time
Incendiary Arrows

Incendiary Arrows

IV

Ranged Technology

Flammable munitions grant non-gunpowder ranged units a siege arrow or bolt when attacking buildings and increase their damage by +20%.

500wood
1000gold
90time