A kingdom is a group of settlements that are allied, and all kingdoms are approximately the same size. When you sign up, you are placed in a random kingdom of the type that you choose (either plain, forest, mountain or island). Settlements in the same kingdom can share information with each other, plan coordinated attacks, or just leave each other alone - whatever their preferred style of play is. Settlements in the same kingdom may not attack nor steal from each other.

When you sign up, you have the choice of picking one of four kingdom types, or a random kingdom type. Each kingdom type has specific bonuses and attributes, with the most notable difference between the kingdom types being how many resources are gathered by each villager per hour:

Plain Kingdoms - Hunting villagers retrieve 5,5 food per hour, forestry villagers retrieve 4 lumber per hour, and mining villagers retrieve 4 iron ore per hour. settlements in Plain Kingdoms experience -1 attacking and exploration times (attacking times may never be decreased below 6 hours, however).

Forest Kingdoms - Hunting villagers retrieve 4 food per hour, forestry villagers retrieve 6 lumber per hour, and mining villagers retrieve 4 iron ore per hour. Settlements in Forest Kingdoms receive +10% spy defence and -5% construction costs (drachmae and lumber). This construction cost reduction applies to both buildings and ships.

Mountain Kingdoms - Hunting villagers retrieve 2 food per hour, forestry villagers retrieve 3.5 lumber per hour, and mining villagers retrieve 6 iron ore per hour. Settlements in Mountain Kingdoms receive +7.5% defensive power.

Island Kingdoms - Hunting villagers retrieve 4 food per hour, forestry villagers retrieve 3 lumber per hour, and mining villagers retrieve 3 iron ore per hour. 50 bushels of food are produced by docks every hour instead of the standard 30. Biremes must be sent on attacks to and from settlements on Island Kingdoms to carry troops. Each bireme can carry 25 troops.

Each kingdom in the world of Mythos may elect several of its settlements as ephors. On the Politics page, every settlement in a kingdom may vote for up to three other settlements in the kingdom (note that no settlement may vote for itself) as ephor. The 5 settlements in a kingdom with the most votes will be ephors for that kingdom (but if a settlement does not log in for 36 hours or more, all of its votes from and for other settlements will automatically be removed). If there is a tie number of votes for the 5th ephor, the largest settlement in the tie will be the 5th ephor. If fewer than 5 settlements receive ephor votes, then only the settlements with votes will be ephors. If no settlements in a kingdom receive ephor votes, then the largest settlement in the kingdom will be assigned as the only ephor. Ephors are able to delete posts and discussions from their kingdom's assembly, vote for and declare war against other kingdoms, and change their kingdom's name, whereas non-ephor settlements can not perform any of these actions.

Ephors that are no longer under their patron's guard are presented with the option of voting for war against another kingdom, or voting for no war at all. If more than 50% of the ephors in your kingdom vote for war against the same kingdom, then each ephor in your kingdom will be given the option to officially declare war against that kingdom.

If your kingdom has war declared against another kingdom, then your kingdom will receive a +5% offence bonus against that kingdom, +5% land gains on successful attacks against that kingdom. War can not be undeclared until 2 full days after it was originally declared.

If the kingdom you have war declared against also has war declared back at you (called mutual war), then both kingdoms will receive a +10% offensive power bonus against each other, +10% land gains against each other and -1 hour return time when attacking each other's kingdoms (note that attacking return times may never go below 6 hours). Mutual wars are accompanied by "war morale," which is a measure of which kingdom is winning the war. War morale is gained when your kingdom successfully invades the kingdom you are at war with, and war morale is lost when they successfully invade your kingdom. After two days of mutual war, all settlements in the kingdom with the higher war morale receive a drachmae bonus, and the war comes to an end (the winning kingdom also receives a star next to its kingdom name to signify its victory). Each kingdom can only declare war against one other kingdom at a time, but can have war declared against it by any number of kingdoms.