There are six Kingdoms fighting for control of the British Isles and Ireland:
Gododdin - Gwynedd - Ireland - Norse–Gaels - Pictland - Wessex
As for settlements type you can choose who you want to fight for and choose your kingdom.
Watch out: once you decide to leave a kingdom to join another you won't be able to re-join your old kingdom unless the ruler changes.
Every Kingdom has its own private chat section that can only be seen by Lords and Ladies in the same Kingdom.
Kingdoms fight against each other to hold territories. Each territory provides income to all the lords in a kingdom.
The amount each Lord gets depends on the kingdom type which is picked by the Ruler of a kingdom
Every lord or lady in the kingdom can decide that they want to rebel. Once they make thus decision, they will automatically join any revolt that starts in their Kingdom.
They also get the option to start a revolt themselves, with all other rebel lords joining them in a new Rebel kingdom. This costs 50 Gold, and makes the Rebel leader the ruler of a new Kingdom representing the Rebels. The rebel kingdom might also gain territories held by the kingdom they are rebelling against.
Territories where the Garrison commander has joined the rebellion. Territories that don't have a garrison commander Territories where the Garrison commander is inactive As well as a portion of the territories held by the ruler of the kingdom they are rebelling against.
Rulers of kingdoms have the option to engage in diplomacy with other Kingdoms. There are three levels of relationship possible:
Enemies: kingdoms that you can attack at will, you will have very limited trade with the lords in the kingdom.
Neutral: you cannot attack them, and your trade options are still a bit limited.
Allies: you cannot attack them and can trade much more freely with them.
Any ruler can start a war with a neutral or allied kingdom. Creating a truce or alliance requires one ruler to send a proposal, and the other ruler to accept it.