Full Holy Roman Empire Technology Tree in Age of Empires IV | Units, Buildings, and Upgrades

Age of Empires IV is a real-time strategy game that requires you to memorize tech trees to play effectively and get units out as soon as possible when you need them. However, each civilization has unique features and units, so remembering the prerequisites for each one can be difficult.

Full Holy Roman Empire Tech Tree

The tech tree below is sorted in ascending order by Civilization Age, then alphabetically by Building and the units/upgrades they provide at that Age. If a unit/upgrade is nested in another unit/upgrade, the parent list item is a prerequisite to the child list item.

Dark Age

The following buildings and units become available in the Dark Age.

• Aachen Chapel (Landmark)
• Barracks
  • Dark Age
    • Spearman
      • Hardened Spearman
        • Veteran Spearman (Castle Age)
          • Elite Spearman (Imperial Age)
  • Feudal Age
    • Early Man-at-Arms
      • Man-at-Arms (Castle Age)
        • Elite Man-at-Arms (Imperial Age)
  • Castle Age
    • Landsknecht
      • Elite Landsknecht (Imperial Age
    • Heavy Maces
    • Two-Handed Weapons
  • Imperial Age
    • Riveted Chain Mail
• Dock
  • Dark Age
    • Fishing Boat
    • Transport Ship
  • Feudal Age
    • Trade Ship
    • Galley
    • Extended Lines
      • Drift Nets (Castle Age)
    • Additional Sails
    • Fire Stations
  • Castle Age
    • Hulk
    • Demonlition Ship
    • Armored Hull
    • Navigator Lookout
    • Extra Ballista
  • Imperial Age
    • Carrack
    • Chaser Cannons
    • Explosives
• Farm
• House
• Lumber Camp
  • Dark Age
    • Forestry
  • Feudal Age
    • Double Broadax
      • Lumber Preservation (Castle Age)
        • Crosscut Saw (Imperial Age)
• Meinwerk Palace (Landmark)
  • Feudal Age
    • Bloomery
      • Decarbonization (Castle Age)
        • Damascus Steel (Imperial Age)
    • Steeled Arrow
      • Balanced Projectiles (Castle Age)
        • Platecutter Point (Imperial Age)
    • Fitted Leatherwork
      • Insulated Helm (Castle Age)
        • Mastered Smiths (Imperial Age)
    • Iron Undermesh
      • Wedge Rivets (Castle Age)
        • Angled Surfaces (Imperial Age)
    • Siege Engineering
    • Marching Drills
  • Castle Age
    • Military Academy
• Mill
  • Dark Age
    • Survival Techniques
    • Wheelbarrow
  • Feudal Age
    • Professional Scouts
    • Horticulture
      • Fertilization (Castle Age)
        • Precision Cross-Breeding (Imperial Age)
• Mining Camp
  • Feudal Age
    • Specialized Pick
      • Acid Distillation (Castle Age)
        • Cupellation (Imperial Age)
• Outpost
  • Feudal Age
    • Arrow Slits
    • Fortify Outpost
  • Castle Age
    • Springald Emplacement
  • Imperial Age
    • Cannon Emplacement
• Palisade Gate
• Palisade Wall
• Town Center
  • Dark Age
    • Scout
    • Villager
    • Prelate
  • Feudal Age
    • Textiles

Related: All Holy Roman Empire Civilization Masteries in Age of Empires IV

Feudal Age

The following buildings and units become available in the Feudal Age.

• Archery Range
  • Feudal Age
    • Archer
      • Veteran Archer (Castle Age)
        • Elite Archer (Imperial Age)
  • Castle Age
    • Crossbowman
      • Elite Crossbowman (Imperial Age)
  • Imperial Age
    • Hand Cannoneer
• Battering Ram
• Blacksmith
  • Feudal Age
    • Bloomery
      • Decarbonization (Castle Age)
        • Damascus Steel (Imperial Age)
    • Steeled Arrow
      • Balanced Projectiles (Castle Age)
        • Platecutter Point (Imperial Age)
    • Fitted Leatherwork
      • Insulated Helm (Castle Age)
        • Mastered Smiths (Imperial Age)
    • Iron Undermesh
      • Wedge Rivets (Castle Age)
        • Angled Surfaces (Imperial Age)
    • Siege Engineering
  • Castle Age
    • Military Academy
• Burgrave Palace (Landmark)
  • Feudal Age
    • Spearman
      • Hardened Spearman
        • Veteran Spearman (Castle Age)
          • Elite Spearman (Imperial Age)
    • Early Man-at-Arms
      • Man-at-Arms (Castle Age)
        • Elite Man-at-Arms (Imperial Age)
  • Castle Age
    • Landsknecht
      • Elite Landsknecht (Imperial Age)
    • Heavy Maces
    • Two-Handed Weapons
  • Imperial Age
    • Riveted Chain Mail
• Market
  • Feudal Age
    • Trader
• Regnitz Cathedral (Landmark)
• Siege Tower
• Stable
  • Feudal Age
    • Scout
    • Horseman
      • Veteran Horseman (Castle Age)
        • Elite Horseman (Imperial Age)
  • Castle Age
    • Knight
      • Elite Knight (Imperial Age)
• Stone Wall
• Stone Wall Gate
• Stone Wall Tower

Castle Age

The following buildings and units become available in the Castle Age.

• Elzbach Palace
  • Castle Age
    • Springald Emplacement
    • Boiling Oil
    • Slate and Stone Construction
  • Imperial Age
    • Cannon Emplacement
    • Reinforced Defenses
• Keep
  • Castle Age
    • Springald Emplacement
    • Boiling Oil
    • Slate and Stone Construction
  • Imperial Age
    • Cannon Emplacement
    • Reinforced Defenses
• Monastery
  • Castle Age
    • Prelate
    • Herbal Medicine
    • Benediction
    • Devoutness
    • Inspired Warriors
  • Imperial Age
    • Piety
    • Tithe Barns
• Siege Workshop
  • Castle Age
    • Springald
    • Mangonel
    • Counterweight Trebuchet
    • Greased Axles
  • Imperial Age
    • Bombard
    • Culverin
    • Roller Shutter Triggers
    • Adjustable Crossbars
    • Siege Works
• Palace of Swabia (Landmark)
  • Dark Age
    • Scout
    • Villager
    • Imperial Officer
  • Feudal Age
    • Textiles

Imperial Age

The following buildings and units become available in the Imperial Age.

• Great Palace of Flensburg (Landmark)
• University
  • Imperial Age
    • Chemistry
    • Geometry
    • Biology
    • Incendiary Arrows
    • Court Architects
    • Elite Army Tactics

That's the entire tech tree for the Holy Roman Empire Civilization!

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