The holy orders will then serve the former heresy. Should the heretic religion become more widespread than the parent religion, the heresy will displace it and become the new orthodoxy. While this eases expansion for heretic lords surrounded by former co-religionists, heretics do not gain access to holy orders. Heretics and their parent religions gain holy war CBs on each other. Players can, however, choose to become heretics themselves. Their spread is problematic because the relations penalty between heretics and members of the parent religion is severe and thus fosters feudal strife. Heresies are especially likely to appear and spread rapidly if the moral authority of the parent religion has been eroded considerably. The one whose war contribution is the greatest is awared control of the target territory if successful. Once a great holy war has been called, all members of that religion may join the war. Zoroastrians and Jews immediately gain access to great holy wars upon restoring their priesthoods. Once both crusades and jihads are unlocked, the reformed pagans will gain access to great holy wars. The name of this CB changes by religion: Catholics have crusades Muslims have jihads the rest have great holy wars. Great Holy Wars: Catholics, Muslims, Reformed Pagans, Zoroastrians, and Jews gain access to a special CB that allows them to fight for all of the territories in an entire kingdom to win them to the faith. Some holy sites are significant for multiple religions e. Holding holy sites gives religions more moral authority. Religions with higher moral authority more easily convert characters and provinces to their faith, while religions with lower moral authority are less likely to gain converts and are suscepitible to heresy.ДЄ religion's moral authority is dependent on the attributes of the religion's head, the number of holy sites held by the relgion, success in religous wars and other considerations. Certain actions such as excommunications, sanctioned invasions and relgious reformation require a minimum moral authority. The other pagan religions get a normal high priest who is a vassal to the ruler who reformed the religion. The Norse leader is the Fylkir, a title held by a Norse ruler, which functions much like the Caliphate.

Pagan religions start without a religious head, but gain one once the religion has been reformed. These individuals may or may not be playable depending on the relgion, and often have unique mechanics. These people are recognised by the adherents of that particular faith to be the leader of the religion. Each of these except Zoroastrian and Jewish is subdivided into multiple branches, which may in turn have their own sub-branches known as heresies.ДЄ list of religions is given below.

There are six main religious groups in Crusader Kings II. Each character in Crusader Kings II has a religion, and the religion of the player's character determines what mechanics are available to the player. Religion is a key concept in Crusader Kings II, and the different religions and their interactions greatly affect how the game is played.

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