Eastern Roman Empire technologies
The civil and military research trees of Eastern Roman Empire (Eastern Roman, Grand Campaign), line by line as the game lays them out. Hover or tap a technology for its research points, gold per turn, effects, the buildings it unlocks and what it needs first. Eastern Roman Empire units.
COMPUTEDBoth trees together cost 49,700 research points. Each tooltip also shows what reaching that technology costs: its own points plus every technology it needs first, each counted once. Before research-rate bonuses.
Civil technologies (28)
Moulded ArchitectureMoulded Architecture300 research pointsUnlocks: Circus, Great Theatre, Imperial Library. Architecture should always be far more than one stone placed atop another.
Specialised CraftsmenSpecialised Craftsmen600 research points · 1,400 research points to reach it (cheapest route)
Construction cost: -5% for industrial buildingsRequires: Regional TraditionsUnlocks: Pewter Artisans, Adobe Maker, Leatherworker. There is no better service than from one who knows his craft.
Hereditary CareersHereditary Careers1,200 research points · 2,600 research points to reach it (cheapest route)
Wealth: +5% from industrial buildingsRequires: Specialised CraftsmenUnlocks: Pewter Manufacture, Adobe Kilns, Builder's Workshop, Leather Manufacture. "My father was a baker, I am a baker. You, too, will bake."
Specialised IndustrySpecialised Industry2,000 research points · 8,700 research points to reach it (cheapest route)Wealth: +5% from industrial buildingsRequires: Hereditary Careers, Imperial LogothetesUnlocks: Grand Forge, Foundry, Glass Workshop, Lumber Camp. A potter makes pottery. He makes it better than everyone else.
Craft OrganisationsCraft Organisations2,000 research points · 10,700 research points to reach it (cheapest route)Construction cost: -5% for industrial and agricultural buildingsWealth: +5% from industrial and agricultural buildingsRequires: Specialised IndustryUnlocks: Dye Factory, Deep Gold Mine, Sculptor, Marble Quarry Complex, Salt Trading Post. Where one may fail, many will succeed.
Natural PhilosophyNatural Philosophy300 research pointsUnlocks: Amphitheatre, Theatre, Library. Pure thought must eventually give way to practical evidence.
Regional TraditionsRegional Traditions300 research points · 800 research points to reach it (cheapest route)
Growth: +1Requires: Greek Philosophical RevivalUnlocks: Wheat Farm, Stone Cutter, Sheep Pens. People respond well to the observance of tradition's rituals.
Tributary ServantsTributary Servants300 research points · 1,100 research points to reach it (cheapest route)Wealth: +5% from agricultural buildingsRequires: Regional TraditionsUnlocks: Camel Farm, Cattle Pens, Stables. Rome treats her friends with respect, and her enemies with dignity.
Land TenancyLand Tenancy600 research points · 1,700 research points to reach it (cheapest route)Wealth: +5% from animal husbandry buildingsRequires: Tributary ServantsUnlocks: Wheat Mills. The Empire is vast. In every corner, a new fruit, a new fig, a new market to be exploited.
Long Lease ContractsLong Lease Contracts1,200 research points · 4,700 research points to reach it (cheapest route)Construction cost: -5% for agricultural buildingsRequires: Land Tenancy, Hereditary CareersUnlocks: Camel Ranch, Cattle Farm, Nisean Stables, Sheep Barn. "There are a few, uh, provisos. Ah, a couple of quid pro quo…"
Imperial LogothetesImperial Logothetes2,000 research points · 6,700 research points to reach it (cheapest route)Wealth: +5% from agricultural and animal husbandry buildings
Tax rate: +2%Requires: Long Lease ContractsUnlocks: Fur Market, Olive Oil Mill, Fruit Dryer, Winery. They who set the word control much.
Roman EthicsRoman Ethics300 research pointsUnlocks: Municipium, Colonia. One prize, one goal, one faith, one God.
Greek Philosophical RevivalGreek Philosophical Revival200 research points · 500 research points to reach it (cheapest route)Corruption: -1% of current valueRequires: Roman EthicsA day's thought can save a lifetime of fruitless labour.
Imperial ChurchImperial Church100 research points · 2,100 research points to reach it (cheapest route)
Public order: +2 from bureaucratic reforms
Religious influence: +1 state religion
Disables the legacy technology "Moulded Architecture"Requires: Tributary Servants, Hereditary OfficesCosts 2,500 gold per turn while researched. Only religion stands between the Empire and anarchy.
Canonical LawCanonical Law100 research points · 2,200 research points to reach it (cheapest route)Religious influence: +1 state religionDisables the legacy technology "Natural Philosophy"Requires: Imperial ChurchCosts 10,000 gold per turn while researched. Unlocks: Arian Patriarchal Basilica, Arian Basilica, Arian Monastery, Arian Sanctuary, Latin Patriarchal Basilica, Latin Basilica, Latin Monastery, Latin Sanctuary, Greek Patriarchal Basilica, Greek Basilica, Greek Monastery, Greek Sanctuary. His word literally is the law.
Ecclesiastical JurisdictionEcclesiastical Jurisdiction100 research points · 7,100 research points to reach it (cheapest route)Corruption: -2% of current valueReligious influence: +1 state religionDisables the legacy technology "Improved Plumbing"Requires: Canonical Law, Long Lease Contracts, State Construction ProgrammeCosts 10,000 gold per turn while researched. Unlocks: Arian Partriarchal Cathedral, Arian Cathedral, Monastic Estates, Latin Patriarchal Cathedral, Latin Cathedral, Monastic Hospice, Greek Patriarchal Cathedral, Greek Cathedral, Greek Monastic School. The laws of God should apply equally to men.
Divine RightDivine Right100 research points · 7,200 research points to reach it (cheapest route)
Political incidents: -25% chance of occuringPublic order: +3 from bureaucratic reformsDisables the legacy technology "Concrete"Requires: Ecclesiastical JurisdictionCosts 25,000 gold per turn while researched. Unlocks: Arian Patriarchal See, Latin Patriarchal See, Greek Patriarchal See. The monarch rules by grace of God.
Byzantine State AuthorityByzantine State Authority3,000 research points · 18,000 research points to reach it (cheapest route)Corruption: -5% of current valueTax rate: +5%Public order: +5 from bureaucratic reformsRequires: Divine Right, Byzantine Bureaucracy, Imperial LogothetesUnlocks: Imperial Palace. "Resistance is useless!"
Improved PlumbingImproved Plumbing300 research pointsUnlocks: Aqueduct Network, Thermae, Cloaca. All towns need to be brought to ordure.
Codification of LawsCodification of Laws300 research points · 800 research points to reach it (cheapest route)Wealth: +3% from cultural buildingsRequires: Greek Philosophical RevivalUnlocks: Governor's Estate. The law, as laid down, governs the Empire.
Hereditary OfficesHereditary Offices600 research points · 1,400 research points to reach it (cheapest route)Construction cost: -10% for main settlement buildingsRequires: Codification of LawsUnlocks: Urbs, Town. "You are good at what you do because it is in your blood."
State Construction ProgrammeState Construction Programme1,200 research points · 2,600 research points to reach it (cheapest route)Construction time: -1 for main settlement buildingsWealth: +5% from cultural buildingsRequires: Hereditary OfficesUnlocks: Metropolis, Fortified Town, Mint. Whatever walls were raised before shall be raised again higher, and stronger.
Byzantine BureaucracyByzantine Bureaucracy2,000 research points · 8,400 research points to reach it (cheapest route)Construction cost: -15% for civic buildingsWealth: +7% from cultural buildingsRequires: Centralised Civil Service, State Construction ProgrammeUnlocks: Governor's Palace, Treasury. "Not actually evil, but bureaucratic, officious and callous."
ConcreteConcrete300 research pointsUnlocks: Aqueduct, Balnae, Sewers. As easy to work as a child's mud pie, yet as strong as stone.
Contractual RegulationsContractual Regulations600 research points · 1,400 research points to reach it (cheapest route)
Wealth: +3% from commercial buildingsRequires: Codification of LawsUnlocks: Fishing Wharf, Trade Wharf, Food Market. A deal is a deal, especially when it's fully codified.
Commerce LawCommerce Law1,200 research points · 2,600 research points to reach it (cheapest route)Wealth: +5% from commercial buildingsRequires: Contractual RegulationsUnlocks: Food Emporium, Slave Market, Wine Market. The first law of commerce: if you're buying, I'm selling.
Centralised Civil ServiceCentralised Civil Service2,000 research points · 4,600 research points to reach it (cheapest route)Corruption: -3% of current valueRequires: Commerce LawUnlocks: Fishing Port, Trade Port, Slave Emporium, Wine Emporium. Ask not what the Empire can do for you...
State MonopoliesState Monopolies2,000 research points · 6,600 research points to reach it (cheapest route)Wealth: +7% from commercial buildingsTrade income: +10% trade agreement tariffsRequires: Centralised Civil ServiceUnlocks: Gem Market, Jeweller, Spice Trading Port, Silk Road Bazaar. If you don't like it, you know what you can do.
Military technologies (24)
Compulsory LevyCompulsory Levy600 research points · 1,300 research points to reach it (cheapest route)
Recruitment cost: -10% for melee infantry unitsRequires: Hereditary ServiceComprehension is not vital to compliance. Nor is willingness.
New Conscription SystemNew Conscription System1,200 research points · 4,500 research points to reach it (cheapest route)
Upkeep cost: -3% for all unitsRequires: Compulsory Levy, New TacticsThe Empire needs more than a few good men.
Barbarian RecruitsBarbarian Recruits2,000 research points · 6,500 research points to reach it (cheapest route)Recruitment cost: -15% for mercenary units (all characters)
Recruitment cost: -10% for cavalry units
Recruitment cost: -10% for ranged infantry unitsRequires: New Conscription System"Trade those piteous pelts for lovely mail!"
Mercenary ExploitationMercenary Exploitation2,000 research points · 8,500 research points to reach it (cheapest route)Upkeep cost: -30% for mercenary unitsRequires: Barbarian Recruits"We can pay you two thousand now, plus fifteen when we win."
Hereditary ServiceHereditary Service300 research points · 700 research points to reach it (cheapest route)
Upkeep cost: -10% for melee infantry unitsRequires: Functional Specialisation"I am a Legionary, like my father before me, like his father before him."
Traditions of StrategyTraditions of Strategy600 research points · 1,300 research points to reach it (cheapest route)
Battle movement speed: +5%Requires: Hereditary ServiceIf it isn't broke, don't reform it.
New TacticsNew Tactics1,200 research points · 2,700 research points to reach it (cheapest route)Fatigue rate: -20%Requires: Imperial Transport ServiceThe military machine must change, or be consumed by the changing times.
Eastern Heavy Cavalry TacticsEastern Heavy Cavalry Tactics1,200 research points · 5,700 research points to reach it (cheapest route)
Charge bonus: +5% for cavalry unitsCharge bonus: +5%Requires: New Conscription System, New TacticsThe thunder of cavalry sweeps away all before it.
Professional SoldieryProfessional Soldiery200 research pointsUnlocks: Rally Field. "Survive this battle, and next time, you will stand in the second rank."
Functional SpecialisationFunctional Specialisation200 research points · 400 research points to reach it (cheapest route)Requires: Professional SoldieryUnlocks: Cavalry Corral, Infantry Grounds, Skirmisher Range. "Skirmishers! Forward! Harass the flanks!"
Military StandardisationMilitary Standardisation100 research points · 500 research points to reach it (cheapest route)Requires: Functional SpecialisationCosts 2,500 gold per turn while researched. Unlocks: Infantry Barracks. A streamlined, efficient army is generally a victorious one.
Imperial Transport ServiceImperial Transport Service100 research points · 1,500 research points to reach it (cheapest route)Requires: Military Standardisation, Traditions of StrategyCosts 2,500 gold per turn while researched. Unlocks: Military Wharf, Cavalry Stables, Skirmisher Barracks. From shore to shore, across road or mountain, the Empire will get you there.
Elite PrivilegesElite Privileges100 research points · 4,000 research points to reach it (cheapest route)Requires: Imperial Transport Service, Weapon ManufactoriesCosts 10,000 gold per turn while researched. Unlocks: Cavalry Compound, Infantry Compound. "You are the elite. You will be treated as such."
Federate ForcesFederate Forces100 research points · 8,300 research points to reach it (cheapest route)Requires: Elite Privileges, Eastern Heavy Cavalry TacticsCosts 25,000 gold per turn while researched. Unlocks: Military Port, Skirmisher Compound. They are not Romans, but fight as if they were. Rome can ask no more.
BilletingBilleting2,000 research points · 13,500 research points to reach it (cheapest route)
Replenishment: +2%Upkeep cost: -5% for all unitsRequires: Defensive Logistics, Federate ForcesTo be billeted surely is an excellent adventure.
Militarised SocietyMilitarised Society3,000 research points · 18,500 research points to reach it (cheapest route)
Integrity: +3
Recruitment capacity: +1Recruitment capacity: +1 when hording.Requires: Billeting, Language of ComradeshipThe will of the army is furnished by the work of the people.
Military ProvisionsMilitary Provisions300 research points · 700 research points to reach it (cheapest route)Ammunition: +5%Requires: Functional SpecialisationUnlocks: Armourer, Blacksmith, Carpenter. An army marches on its well-made caligae.
Weapon ManufactoriesWeapon Manufactories1,200 research points · 2,800 research points to reach it (cheapest route)Ammunition: +10% for missile infantryRequires: Military Provisions, Military RegionalisationUnlocks: Armoury, Weaponsmith, Carpentry Workshop. Mass-made weaponry is not an art, it is a science.
Defensive LogisticsDefensive Logistics2,000 research points · 6,000 research points to reach it (cheapest route)Ammunition: +10% for artillery
Enables construction of heavy siege engines
Ammunition: +25% during siege defence battlesRequires: Defence in Depth, Weapon ManufactoriesUnlocks: Royal Armoury, Master Weaponsmith, Siege Workshop. Victory in the field and in the balance books.
Improved Incendiary WarfareImproved Incendiary Warfare2,000 research points · 8,000 research points to reach it (cheapest route)Missile attack rate: +10 for siege unitsAttrition: -30% when laying siege (all forces)
Enemy siege holdout time: -1 (double for city-ports)Requires: Defensive Logistics"Burn the lands and boil the seas."
Payment in KindPayment in Kind300 research points · 1,000 research points to reach it (cheapest route)Integrity: +1Requires: Military Provisions"Money is useless - can I interest you in an amusingly-shaped sundial?"
Military RegionalisationMilitary Regionalisation600 research points · 1,600 research points to reach it (cheapest route)Enables construction of medium siege enginesSiege holdout time: +1 (double for city-ports)Requires: Payment in KindSmaller, better, faster, stronger.
Defence in DepthDefence in Depth1,200 research points · 2,800 research points to reach it (cheapest route)
Campaign movement range: +10%Attrition: -30% when under siege (all forces)Siege holdout time: +1 (double for city-ports)Requires: Military RegionalisationIn order to take ground, you must first give it.
Language of ComradeshipLanguage of Comradeship2,000 research points · 4,800 research points to reach it (cheapest route)
Unit experience: +1 for all recruitsIntegrity: +1Requires: Defence in Depth"By all that you hold dear on this good earth, I bid you stand!"
From technology_node_sets, technology_nodes (with this faction's own nodes in place of the shared ones), technology_node_links, technology_effects_junction and building_level_required_technology_junctions (Steam build 25370302).