
Becoming Catholic in *Crusader Kings II* (CK2) involves a strategic process within the game's mechanics, particularly if you're playing as a character of a different faith. To convert, you must first accumulate enough Piety, a resource gained through various religious actions like donating to the church or going on pilgrimages. Once you have sufficient Piety, you can hire a Court Chaplain and assign them the task of converting you to Catholicism. Alternatively, if you control a Catholic vassal or are married to a Catholic character, you may have the option to convert through their influence. However, be cautious of the potential consequences, such as opinion penalties from vassals or rulers of your current faith. Successfully converting to Catholicism opens up new gameplay opportunities, including access to unique Catholic mechanics like the Pope and Holy Orders, which can significantly impact your realm's stability and expansion.
| Characteristics | Values |
|---|---|
| Religion | Catholic |
| Group | Christian |
| Doctrine | Papal Primacy, Clerical Marriage, Religious Orders |
| Tenet | None (as it's a doctrine, not a tenet) |
| Holy Sites | Rome, Santiago de Compostela, Canterbury, Jerusalem, Alexandria, Antioch, Constantinople, Agra, Varanasi |
| Moral Tenets | |
| Religious Head | Pope (elected by Cardinals) |
| Religious Council | Cardinals (appointed by the Pope) |
| Conversion Difficulty | Easy (same group as other Christian faiths) |
| Special Mechanics | - Papal Influence: The Pope can grant special bonuses and privileges to rulers. - Crusades: Catholics can call for Crusades to reclaim holy sites. - Indulgences: Rulers can purchase indulgences from the Pope to reduce piety costs. |
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What You'll Learn
- Meet Faith Requirements: Ensure character has Catholic faith or convert via events/decisions
- Control Holy Roman Empire: Hold Emperor title to gain religious authority
- Appoint Bishops: Control dioceses by appointing loyal bishops for influence
- Holy Wars & Crusades: Declare wars to expand Catholicism and gain piety
- Papal Favor: Maintain good relations with the Pope for bonuses and support

Meet Faith Requirements: Ensure character has Catholic faith or convert via events/decisions
In Crusader Kings II, ensuring your character meets the faith requirements to become Catholic is a crucial step if you aim to join the Catholic faith. The most straightforward way to achieve this is by starting the game with a character who is already Catholic. When creating a new game, pay close attention to the character selection screen, where the religion of each character is clearly displayed. Opt for a character whose portrait is marked with the Catholic cross to guarantee that your ruler is already aligned with the Catholic faith. This eliminates the need for conversion and allows you to focus on other aspects of gameplay immediately.
If your character is not initially Catholic, conversion becomes necessary. One method to convert is through the use of events and decisions within the game. Keep an eye on the event notifications, as certain events can trigger opportunities for religious conversion. For example, events involving religious figures, such as bishops or missionaries, may offer your character the chance to convert to Catholicism. Accepting these offers will change your character’s faith, provided the conditions of the event are met. Additionally, some decisions in the game, particularly those related to religious matters, may allow you to switch faiths, so regularly check the decision menu for such options.
Another way to convert to Catholicism is by marrying a Catholic spouse. If your character marries a Catholic, there is a chance that over time, your character may adopt the spouse’s faith. This process can be accelerated by having a strong relationship with the spouse and ensuring they hold significant influence in your court. However, this method is less direct and relies on random event triggers, so it may not always be reliable. It’s also important to note that marrying a Catholic does not guarantee conversion, but it increases the likelihood of faith-changing events occurring.
For rulers, inviting a Catholic courtier to your court can also create opportunities for conversion. By employing a Catholic priest or bishop, you may gain access to decisions or events that facilitate conversion. These courtiers can influence your character’s faith through counseling or religious teachings. To invite a Catholic courtier, use the “Invite Courtiers” option in the council screen, ensuring you filter for characters of the Catholic faith. Once in your court, their presence can trigger events that allow you to convert.
Lastly, if you control a realm with multiple faiths, consider the “Reform Religion” option if you are the leader of a non-Catholic faith. While this does not directly convert you to Catholicism, it can create a custom faith that may have doctrines more aligned with Catholic principles. However, this method is complex and may not always result in a faith that is recognized as Catholic by the game. Therefore, it is generally more efficient to pursue direct conversion methods through events, decisions, or marriage. By carefully navigating these options, you can ensure your character meets the faith requirements to become Catholic in CK2.
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Control Holy Roman Empire: Hold Emperor title to gain religious authority
Controlling the Holy Roman Empire and holding the Emperor title is one of the most effective ways to gain religious authority as a Catholic ruler in *Crusader Kings II*. The Emperor of the Holy Roman Empire (HRE) holds significant influence over the Catholic world, including the ability to call special Imperial wars, influence the Pope, and shape the religious landscape. To achieve this, you must first understand the mechanics of the HRE and the path to becoming its Emperor. The HRE is an elective monarchy, meaning the Emperor is chosen by a group of powerful vassals known as Electors. To secure the title, you must either be elected or usurp the throne through force or cunning.
The first step to controlling the Holy Roman Empire is to either start as a ruler within the HRE or conquer your way into it. If you begin outside the Empire, focus on expanding your territory into HRE lands, preferably by targeting weaker or less defended counties. Once you hold land within the HRE, you become a vassal of the Emperor, which is a necessary step to eventually claim the title for yourself. As a vassal, you should aim to increase your power and influence by marrying into powerful families, forming alliances, and improving your military and economic strength. This will position you as a strong candidate for the Imperial throne.
To become Emperor, you must win the favor of the Electors. This can be achieved through diplomacy, bribery, or marriage alliances. Electors are more likely to vote for a candidate who is Catholic, has high prestige, and holds significant territory within the Empire. Focus on improving your character's traits, winning wars, and accumulating prestige through successful campaigns or pious actions. Additionally, consider gifting valuable artifacts or gold to Electors to sway their votes in your favor. If diplomacy fails, you can also plot to assassinate Electors who oppose you or declare war to force your claim, though this approach carries significant risks and can lead to excommunication or rebellion.
Once you secure the Emperor title, you gain immense religious authority within the Catholic world. The Emperor has the unique ability to call Great Holy Wars, which allow you to conquer entire kingdoms in the name of the faith. You can also influence the Pope by calling for Crusades or using your Imperial authority to sway papal elections. As Emperor, you can also reform the HRE into a more centralized state, such as the HRE Reformation or the establishment of the Imperial Government, which further solidifies your control and religious influence. Use your position to promote Catholicism, suppress heresies, and expand the faith's reach across Europe.
Maintaining control of the Holy Roman Empire requires careful management of your vassals and continued expansion of your power. Keep the Electors loyal by granting them titles, honoring their requests, and ensuring their satisfaction. Be wary of factions that may form against you, as they can lead to revolts or attempts to depose you. Continuously work to strengthen your dynasty by marrying into powerful families, educating your heirs, and securing strong alliances. By holding the Emperor title and effectively managing the HRE, you will not only gain immense religious authority but also become a dominant force in the Catholic world, paving the way for your rise as a Catholic powerhouse in *Crusader Kings II*.
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Appoint Bishops: Control dioceses by appointing loyal bishops for influence
In Crusader Kings II, appointing loyal bishops is a crucial strategy for gaining influence and control over dioceses as you work towards becoming the head of the Catholic faith. The first step in this process is to ensure that you have a strong relationship with the current bishop of the diocese you’re targeting. Building a positive relationship can be achieved through gifts, favors, or by supporting them in ecclesiastical matters. Once you have their trust, you can begin to influence their decisions and, eventually, their willingness to step down or recommend your chosen candidate as their successor.
To appoint a loyal bishop, you must identify a suitable candidate within your court or realm who shares your religious and political goals. This individual should ideally have high learning and stewardship skills, as these attributes are essential for effective diocesan management. Additionally, ensuring they are of your dynasty or a closely allied family can further solidify their loyalty. Once you have a candidate in mind, use your influence with the current bishop or the Pope to push for their appointment. This may involve bribing, scheming, or leveraging your existing religious authority.
Controlling dioceses through loyal bishops grants you significant advantages. Bishops with strong ties to your realm can sway religious votes in your favor, support your claims to titles, and even provide military or financial aid when needed. Moreover, they can help you accumulate more piety, which is essential for launching holy wars or influencing the Pope. To maximize their effectiveness, ensure your appointed bishops are well-protected and supported, as rival factions may attempt to remove them from power.
Another key aspect of this strategy is managing the Pope’s favor. The Pope has the ultimate authority to confirm bishop appointments, so maintaining a positive relationship with the Papacy is vital. This can be achieved by participating in crusades, donating gold to the church, or supporting papal requests. If the Pope is favorably disposed towards you, they are more likely to approve your bishop candidates, giving you greater control over key dioceses.
Finally, once your loyal bishops are in place, use their influence to further your ambitions. Encourage them to spread your dynasty’s influence by appointing family members to key ecclesiastical positions or supporting your claims to new territories. Over time, a network of loyal bishops can become a powerful tool in your quest to dominate the Catholic world and eventually become the head of the faith. Remember, patience and strategic planning are key, as building such a network takes time and careful maneuvering.
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Holy Wars & Crusades: Declare wars to expand Catholicism and gain piety
In Crusader Kings II, expanding Catholicism and gaining piety through Holy Wars and Crusades is a strategic way to strengthen your position as a Catholic ruler. Holy Wars allow you to declare war on neighboring non-Catholic realms, claiming their titles and converting their lands to Catholicism. To initiate a Holy War, you must first ensure that your liege or the Pope has granted you the right to wage one. This typically requires being a Catholic ruler with a strong relationship with the Pope or holding a holy order title. Once eligible, you can select a non-Catholic county or duchy within the de jure borders of a Catholic kingdom and declare a Holy War to conquer it.
Crusades, on the other hand, are larger-scale religious wars called by the Pope to reclaim holy sites or territories from non-Catholics. When a Crusade is declared, Catholic rulers are invited to join, and participating can yield significant rewards, including piety, prestige, and claims on the target territory. To maximize your gains, ensure your troops are well-prepared and contribute significantly to the war effort. Successfully capturing the Crusade target will grant you a claim on the title, allowing you to press it and expand your Catholic realm.
To declare Holy Wars effectively, focus on targeting weaker or isolated non-Catholic realms to minimize resistance. Use the "Claim" button in the intrigue menu to identify potential targets and assess their strength. Building a strong alliance network with other Catholic rulers can also provide additional troops and support during these wars. Remember that Holy Wars and Crusades are not only about territorial expansion but also about increasing your piety, which can be used to influence the Pope or gain divine favor.
Gaining piety through these religious wars is crucial for advancing your character's religious standing. Each successful Holy War or Crusade participation grants a substantial piety reward, which can be used to purchase papal favors, such as declaring someone a crusader king or gaining a holy order. Additionally, holding and defending holy sites, like Jerusalem, can provide a steady piety income. Focus on maintaining a strong relationship with the Pope by donating gold or supporting papal requests to ensure continued access to these opportunities.
Finally, timing is key when engaging in Holy Wars and Crusades. Wait for opportune moments, such as when the target realm is embroiled in internal conflicts or when you have amassed sufficient troops and allies. Avoid overextending your realm by taking on more than you can handle, as this can lead to rebellions or external invasions. By carefully planning and executing these religious wars, you can effectively expand Catholicism, gain piety, and solidify your legacy as a devout Catholic ruler in Crusader Kings II.
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Papal Favor: Maintain good relations with the Pope for bonuses and support
Maintaining good relations with the Pope in *Crusader Kings II* is crucial for any ruler seeking to become Catholic or solidify their position within the faith. Papal Favor is a powerful resource that grants various bonuses, including moral authority, prestige, and even direct support from the Papacy. To cultivate Papal Favor, start by ensuring your character is pious and virtuous, as the Pope favors rulers who embody Catholic values. Avoid sins like adultery, homosexuality, and murder, as these can lead to excommunication and a loss of favor. Regularly donate gold to the Pope through the “Grant Piety” option, as this is one of the most direct ways to increase your standing with the Papacy.
Another effective method to gain Papal Favor is by participating in and supporting Holy Wars. The Pope highly values rulers who defend or expand the Catholic faith through military campaigns. Joining crusades or initiating Holy Wars against heretics, infidels, or schismatics will not only earn you favor but also strengthen your position within the Catholic world. Additionally, consider marrying into families with strong ties to the Papacy or those who already hold significant Papal Favor, as this can indirectly boost your own standing.
Diplomatic actions also play a key role in maintaining good relations with the Pope. Supporting the Pope’s requests, such as calling for a crusade or backing his claims in disputes, will earn you favor. Conversely, opposing the Pope or refusing his calls can lead to a rapid decline in your standing. Be mindful of the Pope’s goals and align your actions with his interests whenever possible. For example, if the Pope is focused on reclaiming Jerusalem, prioritize actions that contribute to that objective.
As a ruler, you can further enhance your relationship with the Pope by appointing family members or loyal vassals as bishops or cardinals. Having allies within the College of Cardinals increases your influence over papal elections and ensures that a friendly Pope is elected. This can be achieved by educating your children or wards with the "Theologian" trait, which increases their chances of becoming bishops. Once they hold ecclesiastical positions, they can contribute to your Papal Favor through their actions and piety.
Finally, leverage your piety and devotion to the Catholic faith by going on pilgrimages or funding the construction of grand cathedrals. These actions demonstrate your commitment to the Church and can significantly boost your Papal Favor. Keep an eye on the Pope’s opinion of you through the character menu and address any issues promptly. Maintaining high Papal Favor not only grants immediate benefits but also positions you as a key ally of the Papacy, opening doors to greater influence and power within the Catholic world.
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Frequently asked questions
The first step is to find a Catholic county or realm where you can interact with a Catholic court chaplain or bishop. This is essential for initiating the conversion process.
To convert, you need to hire a Catholic court chaplain and then use the "Convert to Catholicism" decision, which requires piety and may incur a prestige cost. Ensure you meet the game’s requirements for conversion.
Yes, rulers can convert to Catholicism, but it may have political and diplomatic consequences. Be prepared for potential revolts or opinion penalties from vassals of your previous faith.
Becoming Catholic grants access to the Catholic faith’s unique mechanics, such as the Pope’s influence, holy orders, and the ability to participate in crusades, which can strengthen your realm.





















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