
In the grand strategy game Europa Universalis IV, players can attempt to convert the Ottoman Empire to Catholicism. This can be achieved through various methods, such as sending a 0 maintenance missionary to convert provinces, allying with Catholic nations, or allowing Catholic rebels to take over provinces. While converting to Catholicism as the Ottomans can be challenging, some players find it amusing and a unique way to play the game. However, it is important to note that converting religions comes with certain drawbacks, such as losing the unique Ottoman government and certain mechanics like the ability to propagate religion through trade.
| Characteristics | Values |
|---|---|
| Religion | Catholic |
| Game | Europa Universalis IV |
| DLC | Rights of Men |
| Strategy | Spawn Catholic rebels |
| Convert provinces | |
| Accept rebel demands | |
| Ally with Hungary, Poland, Ming | |
| Conquer Byzantium | |
| Revoke estates | |
| Move capital to Constantinople | |
| Switch to Greek | |
| Join HRE | |
| Form Roman Empire |
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What You'll Learn

Spawn Catholic rebels by giving Catholic provinces to your Dhimmi
To flip to Catholicism as the Ottomans, one strategy is to exploit the Dhimmi mechanics. Here's a detailed guide on how to do it:
Firstly, you need to acquire some Catholic provinces. Make a rush for Bosnian or Hungarian Catholic land and add it to your territory. Then, grant these newly flipped Catholic provinces to your Dhimmi estates. This will likely upset them, so you can further annoy them by using the ""Demand Money" interaction, which reduces their loyalty.
After a year of granting them the provinces, you can start revoking the Catholic provinces from the Dhimmi, which will further decrease their loyalty. When the Dhimmi are disloyal and you revoke their Catholic provinces, religious rebels will instantly spawn. These rebels will be Catholic zealots, regardless of what the province screen might indicate.
Allow these Catholic rebels free reign over your lands. Turn off all forts so they can move without hindrance. They will start converting your provinces to Catholicism. The more land they convert, the higher your religious unity will be when you flip, making your nation more stable.
Keep in mind that you don't want them to siege your capital, whether it's your original capital or Constantinople, if you've moved it there. You don't want to be caught out by the ticking progress for rebel demands holding your capital.
Eventually, the rebels will attempt to push to the other side of your land through Crimea, as they can't get across the strait. Start taking back your capital and, depending on how many rebels you spawned, they may make it around the Black Sea and continue converting more land.
Once the Catholic rebels control more than 50% of your total development, you can accept their demands, and your state religion will flip to Catholicism.
Additional Tips:
- Remember that it's the total development converted that matters, not the number of provinces.
- If you're having trouble getting religious rebels to spawn and are dealing with separatists or particularists, you might need to use the ""Harsh Treatment" interaction to reduce the rebel faction's loyalty and then send a missionary to flip the rebel type.
- This strategy works best early in your campaign.
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Convert over half of your country to Catholicism
To convert over half of your country to Catholicism when playing as the Ottomans in Europa Universalis IV, you can follow these steps:
First, disable or delete all forts. This will allow rebels to take over more land and convert it to Catholicism. Impose a "new religious tax" on the Dhimmi, who are non-Muslim subjects in your empire. Revoke non-critical provinces in Greece until they become disloyal enough to spawn a rebellion. This will help you generate Catholic zealots who will convert provinces to Catholicism.
Once the rebels have converted about half of your country to Catholicism, you can decide whether to allow them to continue or stop their progress. To stop them, declare war on a minor nation and wait, as rebels can only enforce their demands during peacetime. You will also need to set your vassals to passive and revoke ally military access to prevent them from interfering with the rebels.
To increase the number of Catholic zealots, you can give newly flipped Catholic provinces to the Dhimmi and spawn more zealots. The more provinces they convert, the less you will have to convert later, and the more stable your country will be. Remember that you need at least half of your development to be Catholic to be able to flip religions whenever you want.
Another strategy is to culture-flip to Greek and then become Catholic through estate revoke, preferably by 1450-1460. You can do this by conquering Byzantium and then revoking estates to unstate Turkish provinces in Anatolia, creating new Greek provinces. Move your capital to Constantinople and become an empire before switching to Greek.
Alternatively, you can wait for the Pope to contact you with an offer to convert your nation to Catholicism in exchange for greatness. However, this may cause some of your core provinces to become vassals, which can be inconvenient.
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Accept the rebels' demands to change your state religion
To flip to Catholicism as the Ottomans, one strategy is to allow Catholic rebels to enforce their demands and change your state religion. Here's a step-by-step guide:
Spawn Catholic Rebels
To begin, you'll need to spawn Catholic rebels. One method is to make a rush for Bosnian or Hungarian Catholic land and grant it to your Dhimmi. Then, revoke the Catholic provinces from the Dhimmi, anger them and prompting the spawning of Catholic rebels. Turn off your forts and allow the rebels to take as much land as possible. The more land they convert to Catholicism, the higher your religious unity will be when you flip, resulting in greater stability.
Regain Control
As the rebels approach your capital, start taking back control. You don't want to be caught off guard by the ticking progress for rebel demands in your capital. Depending on the number of rebels spawned, they may continue their expansion, converting more land to Catholicism.
Accept Rebel Demands
Once the rebels have converted over half of your country to Catholicism, you can accept their demands and change your state religion to Catholicism. This will result in a higher level of religious unity and stability within your empire.
Form the Roman Empire
With Catholicism established, you can now work towards forming the Roman Empire. This is one of the few options available to the Ottomans as an endgame tag, along with the Holy Roman Empire (HRE). You can also consider becoming the Protestant Emperor if you choose to convert to Protestantism.
Benefits of Converting to Catholicism
Converting to Catholicism as the Ottomans can have several benefits. It allows you to mess with the HRE and gain a ton of papal influence, which can provide free stability. Additionally, flipping to a Christian faith makes expanding into Europe and the HRE easier and provides opportunities for powerful alliances.
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Flip to Greek culture
Firstly, you should ally with Hungary, Poland, and Ming. This step is only important if you plan to take on AE, which requires improved relations. Next, conquer Byzantium before the end of 1444, finishing by 1445/6. This step is only necessary if you want to convert to Greek, but it wastes adm points. Then, revoke estates to unstate Turkish provinces in Anatolia and state new Greek provinces. After that, take the decision to move your capital to Constantinople and become an empire, then switch to Greek.
After flipping to Greek culture, the next step is to become Catholic through estate revoke, probably by 1450-60. You can do this by making a rush for Bosnian or Hungarian Catholic land and giving it to your Dhimmi. Anger the Dhimmi and then revoke whatever Catholic provinces you have from them, spawning Catholic rebels. Allow them to take as much land as they can, as the more land they flip to Catholic, the higher your religious unity will be when you flip, and you will be more stable.
Finally, you can become the Holy Roman Emperor by allying with electors.
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Ally with Hungary, Poland and Ming
To switch to Catholicism, you need to revoke estates to unstate Turkish provinces in Anatolia and state new Greek provinces. Take the decision to move your capital to Constantinople and become an empire, then switch to Greek.
You can also try to flip by sending a 0 maintenance missionary to convert, adding a +6 to the unrest in a province. However, if you've only just taken it over, you won't be able to get religious rebels, only separatists.
Another strategy is to make a rush for Bosnian or Hungarian Catholic land and give it to your Dhimmi. Piss off the Dhimmi and then revoke the Catholic provinces off them, spawning Catholic rebels. Allow them to take as much land as they can – the more land they flip to Catholic, the higher your religious unity will be when you flip, and the more stable your country will be. Turn off all forts and let them take your original capital or Constantinople if you've taken it. Start taking it back, but don't get caught out by the ticking progress for rebel demands holding your capital.
You can also give newly flipped Catholic provinces to the Dhimmi and spawn more zealots. As long as half of your development is Catholic, you'll be able to flip whenever you want.
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Frequently asked questions
Flipping to Catholicism as the Ottomans can be advantageous if you want to become the Holy Roman Emperor, gain control over nations like Spain, and expand into Europe more easily.
By converting to Catholicism, you will lose the benefits of being Sunni, such as a straightforward government and no concerns about heirs and religious unrest. Additionally, you will lose certain Ottoman-specific advantages, including the ability to propagate religion through trade.
One method is to revoke estates to unstate Turkish provinces and convert them to Greek provinces. You can then move your capital to Constantinople and switch to Greek culture. To become Catholic, you can give newly flipped Catholic provinces to the Dhimmi, spawn Catholic rebels, and allow them to take over as much land as possible. Once they control more than 50% of your total development, you can accept their demands and change your state religion.
Another approach is to send a zero-maintenance missionary to a province with positive unrest, which will result in religious rebels. You can then accept their demands and convert your country to Catholicism. Alternatively, you can attempt to influence electors, allies, and guarantors, offering them gifts, royal marriages, and diplomatic relations. This strategy can help you gain enough support to be elected Holy Roman Emperor, facilitating your transition to Catholicism.











































