Reference
Exactly what Romans can train, build and research, by age.
Infantry and Cavalry civilization
•Villagers gather, build, and repair +5% faster
•Infantry armor upgrade effects are doubled
•Scorpions cost -50% gold
•Galley-line and Dromons +1 melee/+1 pierce armor
Team bonusScorpions minimum range reduced
46 units · 28 buildings · 66 technologies. Each building carries what it trains and researches; upgrades sit under what they upgrade from.