A republic is a realm where the capital is a city holding. Republics can range in size from baronies to empires, and the great naval Republics are playable if the player has The Republic DLC. The great naval Republics are those republics of ducal rank or higher, with a coastal capital. The Republics use succession laws unavailable to normal realms, but can be vassals or lieges to regular counts, dukes etc.
In each great naval Republic there are five patrician families, each with a unique baronial rank holding known as the palace. With The Republic DLC the patrician families are playable, even if their only holding is the family palace. The patrician families use the Agnatic Seniority succession law as used by feudal realms.
The great naval Republics use the Patrician Elective succession law. Elections are held upon the death of the head of the republic, and the next leader is determined from among the five heads of the patrician families - depending on age and prestige. They can also allot campaign funds to increase their chance of being elected.
It is impossible to have one great naval Republic as the vassal of another. Republics that are not great naval republics use the Open Elective succession law.
The title afforded to the head of a republic depends on the rank and culture:
|Latin/Byzantine||Mayor||Lord Mayor||Doge||Serene Doge||Grand Prince|
|Others||Mayor||Lord Mayor||Grand Mayor||Prince Mayor||Grand Prince|
Note religous title variants 'trump' cultural ones. For example, a republican 'duke' with Italian culture and Sunni religion will be known as a Wâli-Emir. The titles of republican realms are as follows:
|All||City||Grand City||Republic||Most Serene Republic||Principality|