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)
- Veteran Spearman (Castle Age)
- Hardened Spearman
- Spearman
- Feudal Age
- Early Man-at-Arms
- Man-at-Arms (Castle Age)
- Elite Man-at-Arms (Imperial Age)
- Man-at-Arms (Castle Age)
- Early Man-at-Arms
- Castle Age
- Landsknecht
- Elite Landsknecht (Imperial Age
- Heavy Maces
- Two-Handed Weapons
- Landsknecht
- Imperial Age
- Riveted Chain Mail
- Dark Age
- 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
- Dark Age
- Farm
- House
- Lumber Camp
- Dark Age
- Forestry
- Feudal Age
- Double Broadax
- Lumber Preservation (Castle Age)
- Crosscut Saw (Imperial Age)
- Lumber Preservation (Castle Age)
- Double Broadax
- Dark Age
- Meinwerk Palace (Landmark)
- Feudal Age
- Bloomery
- Decarbonization (Castle Age)
- Damascus Steel (Imperial Age)
- Decarbonization (Castle Age)
- Steeled Arrow
- Balanced Projectiles (Castle Age)
- Platecutter Point (Imperial Age)
- Balanced Projectiles (Castle Age)
- Fitted Leatherwork
- Insulated Helm (Castle Age)
- Mastered Smiths (Imperial Age)
- Insulated Helm (Castle Age)
- Iron Undermesh
- Wedge Rivets (Castle Age)
- Angled Surfaces (Imperial Age)
- Wedge Rivets (Castle Age)
- Siege Engineering
- Marching Drills
- Bloomery
- Castle Age
- Military Academy
- Feudal Age
- Mill
- Dark Age
- Survival Techniques
- Wheelbarrow
- Feudal Age
- Professional Scouts
- Horticulture
- Fertilization (Castle Age)
- Precision Cross-Breeding (Imperial Age)
- Fertilization (Castle Age)
- Dark Age
- Mining Camp
- Feudal Age
- Specialized Pick
- Acid Distillation (Castle Age)
- Cupellation (Imperial Age)
- Acid Distillation (Castle Age)
- Specialized Pick
- Feudal Age
- Outpost
- Feudal Age
- Arrow Slits
- Fortify Outpost
- Castle Age
- Springald Emplacement
- Imperial Age
- Cannon Emplacement
- Feudal Age
- Palisade Gate
- Palisade Wall
- Town Center
- Dark Age
- Scout
- Villager
- Prelate
- Feudal Age
- Textiles
- Dark Age
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)
- Veteran Archer (Castle Age)
- Archer
- Castle Age
- Crossbowman
- Elite Crossbowman (Imperial Age)
- Crossbowman
- Imperial Age
- Hand Cannoneer
- Feudal Age
- Battering Ram
- Blacksmith
- Feudal Age
- Bloomery
- Decarbonization (Castle Age)
- Damascus Steel (Imperial Age)
- Decarbonization (Castle Age)
- Steeled Arrow
- Balanced Projectiles (Castle Age)
- Platecutter Point (Imperial Age)
- Balanced Projectiles (Castle Age)
- Fitted Leatherwork
- Insulated Helm (Castle Age)
- Mastered Smiths (Imperial Age)
- Insulated Helm (Castle Age)
- Iron Undermesh
- Wedge Rivets (Castle Age)
- Angled Surfaces (Imperial Age)
- Wedge Rivets (Castle Age)
- Siege Engineering
- Bloomery
- Castle Age
- Military Academy
- Feudal Age
- Burgrave Palace (Landmark)
- Feudal Age
- Spearman
- Hardened Spearman
- Veteran Spearman (Castle Age)
- Elite Spearman (Imperial Age)
- Veteran Spearman (Castle Age)
- Hardened Spearman
- Early Man-at-Arms
- Man-at-Arms (Castle Age)
- Elite Man-at-Arms (Imperial Age)
- Man-at-Arms (Castle Age)
- Spearman
- Castle Age
- Landsknecht
- Elite Landsknecht (Imperial Age)
- Heavy Maces
- Two-Handed Weapons
- Landsknecht
- Imperial Age
- Riveted Chain Mail
- Feudal Age
- Market
- Feudal Age
- Trader
- Feudal Age
- Regnitz Cathedral (Landmark)
- Siege Tower
- Stable
- Feudal Age
- Scout
- Horseman
- Veteran Horseman (Castle Age)
- Elite Horseman (Imperial Age)
- Veteran Horseman (Castle Age)
- Castle Age
- Knight
- Elite Knight (Imperial Age)
- Knight
- Feudal 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
- Castle Age
- Keep
- Castle Age
- Springald Emplacement
- Boiling Oil
- Slate and Stone Construction
- Imperial Age
- Cannon Emplacement
- Reinforced Defenses
- Castle Age
- Monastery
- Castle Age
- Prelate
- Herbal Medicine
- Benediction
- Devoutness
- Inspired Warriors
- Imperial Age
- Piety
- Tithe Barns
- Castle Age
- Siege Workshop
- Castle Age
- Springald
- Mangonel
- Counterweight Trebuchet
- Greased Axles
- Imperial Age
- Bombard
- Culverin
- Roller Shutter Triggers
- Adjustable Crossbars
- Siege Works
- Castle Age
- Palace of Swabia (Landmark)
- Dark Age
- Scout
- Villager
- Imperial Officer
- Feudal Age
- Textiles
- Dark Age
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
- Imperial Age
That's the entire tech tree for the Holy Roman Empire Civilization!
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Full Holy Roman Empire Technology Tree in Age of Empires IV | Units, Buildings, and Upgrades
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