In the world of the Imperator: Rome there are still numerous plots that are not occupied by settled tribes, republics or monarchs. Some areas are still a cluster of warlike barbarian tribes. Other regions are occupied by the pirates that are attacking your customers. And, your inner boundaries, may be vulnerable to a rebellion of the local population.
Rebels in Imperator: Rome work a little differently than other games from the Paradox Studio, like Europa Universalis. The revolt/rebellion/uprising will always appear in an organized manner, that is, they will have their own leader, the provisional government and certain borders. With the rebels, everyone will be able to establish diplomatic relations. You will never meet a single army, which just robbed and conquered your cities. Riots always cause rebellions.
Each city has its own level of anxiety. If happiness per capita falls below 50%, it will start to generate anxiety (uncertainty) points. The more anxiety there is in a city, the less taxes and human resources such a city produces. If the level of anxiety/uncertainty increases to 10, you will not be able to train the army and put facilities in this city. If 20% of the province's residents who belong to a foreign culture are disloyal to your government, the Risk of Rebellion bar will begin to slowly fill up. A warning will also appear on the main game screen.
Empire of the Seleucids is in disarray - rebellion broke out, which took a large part of the previous government.
Once the bar gets to full all disloyal provinces with people from other cultures are going to unity in a huge rebellion. The rebels get their color and army. There is one very important difference when you fight the rebels. Unlike war with other nations, captured cities are not occupied, but immediately assimilated into your state. So do rebels, so having a war with this nation is extremely difficult. Remember that you can use a random situation with your neighbors and take the side of the rebels. Thus, you will weaken the economic and military environment of the nation. You can also actively speed up an outbreak of rebellion in another state when you choose to support the rebels. If a riot breaks out, your state will automatically join the rebels.
Barbarians - people from different tribes, which are not friendly towards any nation. They live in a few zones that are inaccessible to the army, and you cannot conquer them in any case.
Each headquarters of the barbarians is determined by two factors: the Growth and Strength of the Barbarians. The second stat tells the significant number of barbarians on the site. The higher, the more likely it is that in this area the uprising of barbarian horde will appear. The army, which main goals are to plunder and pillage. Growth affects the Strength of the barbarians, as well as the speed with which they form a new army. You can reduce the Growth of barbarians by having cities near their headquarters with a high level of civilization. Over time, the barbarians will arrive less and less until the Growth reaches zero. From now on, the barbarians will pose no threat in the area.
The horde of barbarians is a special army which main purpose is to sow confusion and chaos. The size of the army also depends on the strength of the barbarians in their headquarters. The longer the region is not creating an army, the greater the horde may rise that has to be defeated by nations that reside nearby. If the barbarians capture at least one city, it is possible to establish diplomatic relations with them, although the number of options is limited:
- Settle - you can call the barbarians, so they settled in the captured cities. You will get residents in the form of tribal members, depending on the size of the army. They get culture and religion from the region where the army was created.
- Offer client - encourage army of barbarians to create their own state, which will be your "client". Such a state will get the tribe's form of government and become your subordinate.
- Demand surrender - so you can prevent the conflict and the army of barbarians will be terminated and all the cities that they will return to their owners.
- Pay off - if you are unable to deal with barbarians militarily or diplomatically, you can always try to bribe barbarians to take on other targets in the area than yours.
Every city that will be conquered by the barbarians, not only loses its population, but also the level of civilization. Therefore it is necessary to erect forts in the area, or to keep troops, especially if the ratio of Strength of the Barbarians is high. Otherwise, you will lose the civilizational progress that is needed to shut down the region with the barbarians. If you defeat a horde of barbarians, the general will get gold and your cities some slaves.