This seems more than a little overpowered, based on the other idea groups in the game. Their traditions grant +10% Discipline and +1 Yearly Legitimacy, while completing the track gives you an insane +33% Manpower.
Imperium Sine Fine: Core Creation Cost -20% Imperial Bureaucracy: National Tax Modifier +10% Roman Architecture: Production Efficiency +20% The Roman Legions: Land Forcelimit +15%, Infantry Combat Ability +10% If you managed to restore the Roman Empire as Byzantium using CK2's Legacy of Rome DLC, they will be imported into EU4 as an Empire with a unique idea group:
