Each triggers has 3 main components:
- The event which the trigger is linked to (this determines when a trigger is activated)
- The conditions that must be met at the time of the event
- The resulting effects of the trigger.
In Rome: Total War/Barbarian Invasion if you are playing with Religion enabled, triggers are also used to give bonuses to characters for religious conversion rates and bonuses/penalties to order if a certain religion is dominant in a particular settlement.
Triggers are used to generate advice from the advisor.