Scientific
Taruga
Suzerain and envoy bonuses summarised in our own words from the game data.
Suzerain bonus
Each city gains +5% Science for every different improved strategic resource it has.
Game data trace
MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_ALUMINUM_RESOURCE, MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_COAL_RESOURCE, MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_HORSES_RESOURCE, MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_IRON_RESOURCE, MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_NITER_RESOURCE, MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_OIL_RESOURCE, MINOR_CIV_TARUGA_UNIQUE_INFLUENCE_URANIUM_RESOURCEStrategy guide
+5% Science per distinct improved strategic resource in a city. A city working horses, iron, niter and coal is at +20%, and late-game resource spreads push higher. Improve every strategic tile you own — even ones you'll never spend — because here they pay science.
Best civs & plans
Science civs on resource-rich maps get a Campus-scale multiplier; pairs neatly with Hattusa-style resource access if you can hold both.
Envoy plan
Three envoys turn the bonus on, and the scientific-type rewards multiply with it in a way most city-states do not: the percentage applies to each city's whole science output, including the flat Library and University science the first and third envoys add. A resource-rich science empire therefore has a real case for six envoys, since the Research Lab science at that tier is boosted too. AI science civs will contest it, so treat Taruga like Geneva or Mitla and commit early with a two-envoy cushion. Because the value only shows after you have improved several resource types, players often underinvest before the medieval era and then find an AI sitting at five envoys; place Amani early to hold the line cheaply and add real envoys once Niter and Coal appear.
Value by era
In the ancient era only Horses and Iron are visible, so the bonus is a single-digit percentage in one or two cities — real but small. Each resource-revealing technology adds a new tier: Niter in the medieval era, Coal in the industrial era, then Oil, Aluminum, and Uranium, and the bonus in a city that keeps improving every new resource inside its borders climbs step by step toward the seven-resource maximum. Peak value is the modern and atomic eras, which is also when science matters most for a space race. That profile makes Taruga unusually good to grab late: a suzerainty taken in the industrial era applies instantly to every improved strategic tile you already own, so an empire that mined and pastured its resources anyway gets the full benefit the same turn.
Pitfalls and how to protect it
The bonus counts distinct resource types inside each city's borders, so two Iron mines in one city give the same tier as one, and a resource on a tile that has not been improved gives nothing at all — Oil in particular is often left undrilled because nobody needs the fuel yet, which under Taruga is a science mistake. Offshore Oil needs an Offshore Platform, so coastal cities should not ignore it either. Pillaging strips the bonus tile by tile, making resource tiles near the border worth a garrison. Taruga's own defences are ordinary; a conquering neighbour removes the multiplier everywhere at once, which justifies joining a liberation emergency. On a map with little strategic spread, or in a game where an AI already holds five envoys there, the type rewards alone are not worth the fight.
Envoy bonuses
- 1 envoy+1 Science in your capital and in each Library you own.
- 3 envoys+2 Science in each University and each Consulate you own.
- 6 envoys+3 Science in each Research Lab and each Chancery you own.
Envoy bonuses are shared by every city-state of the same type.
Other Scientific city-states
Related guides
- City-States and Envoys: Where Your Influence Should GoWhere envoys come from, how to spend the first handful, which city-state types match each victory plan, how to win and keep suzerainty against the AI, and when conquering a city-state is the right call.Last reviewed: 2026-10-03
- Diplomatic Victory: Earning and Spending FavorA working plan for the Gathering Storm diplomatic victory: where Diplomatic Favor actually comes from, how World Congress sessions and votes turn into victory points, which emergencies, competitions and wonders matter, how to keep alliances alive, and when to spend favor versus hold it against a rival's lead.Last reviewed: 2026-10-03
- Early District Planning: The First 100 TurnsHow to read city sites for future adjacency, decide between settling for yields now or reserving tile clusters, and know when a planned layout should be abandoned.Last reviewed: 2026-10-03
Last reviewed: 2026-10-03