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This article may contain outdated information that is inaccurate for the current version of the game. It was last updated for Vanilla.

Primary culture
Castilian (Iberian)

Capital province
Toledo (219)

Feudal MonarchyGovernment monarchy.png

State religion

Tech group
Ideas and traditions

Traditions.png Traditions:

Morale of armies: +10%
Missionaries: +1

Discipline.png Reconquista

Discipline: +5%
Colonists: +1

Global missionary strength.png Spanish Inquisition

Missionary strength: +2%
Tolerance of heretics & heathens: -1

Papal influence.png Devout Catholicism

Yearly Papal influence: +3

Idea claim colonies.png Inter Caetera

Allows claiming of colonies

Overseas income.png Treasure Fleet

Global tariffs: +15%
Provincial trade power modifier: +10%

Heavy ship power.png A Spanish Armada

Heavy ship combat ability: +10%

Prestige.png Siglo De Oro

Yearly prestige: +1

Idea bonus.png Bonus:

Colonial growth: +25%

Castile in 1444 is the largest country in the Iberian peninsula, bordering Portugal, Aragon, Navarra and (indirectly) Morocco and France. It is an ideal country to start as a new player in EU4.


Main article: Spanish missions

Castile's missions focus on completing the Reconquista and expanding into the New World.


Main article: Spanish events

Iberian Wedding[edit]

Between 1450 and 1500, if neither Castile nor Aragon are vassals and the leader of one of them is male and the leader of the other is female, then there is a chance in twelve every month (1/12 or 8.33%) of this event happening. After it Aragon will enter in a personal union led by Castile.

Spanish Civil War[edit]

If Castile is in a regency before 1500, then there is a chance that a civil war will be generated. Castile will have to choose between supporting the advisor Álvaro de Luna, and thereby face a noble rebellion that might be backed by neighboring Aragon or Navarra, or accept the demands to end unwanted noble influences and face a loss of stability.

Italian Ambition[edit]

If both Castille and France own provinces in Italy between 1490 and 1590. they are able to claim each other's lands, reflecting the Italian Wars that consumed the attention of these two rivals in this period. This event type will lead to worsened relations between the nations and a greater likelihood of war.


Form Spain Diplomatically: This becomes selectable once all the following criteria are satisfied:

Once this decision is chosen, Castile will inherit Aragon's throne, merging the two nations into Spain.


Castile starts off in a unique position among western powers, with a sizeable army, a fair position for colonization, and a great selection of directions to go in.

Neighbors and countries of interest[edit]

  • Aragon
Probably Castile's most bothersome neighbour at this point. The player may try snatching little provinces from them as their armies aren't invincible compared to Castile's. Another option is to wait for an event ('The Iberian wedding') to happen which makes them Castile's junior partner in a personal union.
  • France
After Aragon is gone it can be Castile's biggest threat, and it is conceived to be one of the most powerful countries in-game (nicknamed the "Big Blue Blob"). Unless they border Castile directly, they won't bother the Iberian country too much. Eventually, if Castile manages to grow, France will see them as a competing major power, and so it will be a good idea to be more friendly. If the player wishes to avoid conflict with France entirely, it is best to stay out of Italy.
  • Granada
Castile's Sunni neighbor which stubbornly clings to Iberia. This country cannot be converted to Catholicism until the player has +3 missionary strength (or reach second national idea +2 missionary strength and have an Inquisitor advisor). A decent strategy is to wait until after Castile has high stability, the inquisition, and an advisor or the +3 from Religious Ideas and then invade to take all of Morocco so that Castile may demand more than a single territory at a time.
  • Morocco and Algiers
They usually do not cross the channel with their armies. As long as the player doesn't try invading them, Castile's fair land should have little to worry about. Both countries are often warring each another backed with their smaller allies (Morocco with Tunis and Algiers with Tripoli).
As an option for expansion into Northern Africa, you can wait until the Fezian nationalist will arise in Morocco (this is only the matter of time) which make some Fez cores. Then you can crush and make Morocco to release Fez state, afterwards vassalize Fez and feed them with some more sunni provinces taken from Morocco, Algiers or Portugal in a set of wars. There are several valuable sunni provinces from your trade node Sevilla (Tangiers, Ceuta, Oran, Mellila or Fez). With this strategy you can make a big vassal in Northwestern/Northern Africa which can be annexed once you have enough and strong missionaries (best to have Religious idea) to convert these provinces easily and quickly.
  • Navarra
Small state which can't do much harm. Most of the time an easy first conquest in a relatively safe area, however a Basque culture is not in the Iberian culture group. Watch out that Aragon hasn't snatched them away though as Aragon has missions to vassalize and integrate Navarra.
  • Portugal and England
These countries start off as allies of one another. This may be used against Portugal, for devastating effect. Eventually England should have a war with France, and France will almost certainly request military access, so that they may easily go and damage the Portuguese armies.
It is good to have a claim on one of the Portuguese provinces when the war ends, so that Castile may go to war with Portugal and demand The Azores and Madeira in the treaty. Portugal tends not to be aggressive unless provoked or in a coalition against Castile. It even has a 'historical friend' bonus to relations, which makes them less likely to attack their Iberian neighbor than to attack other nations. Once you have their colonies, you can start improving relations and make Portugal an ally.
In addition, if you focus also on reaching Exploration idea (colonist and explorer/conquistador ideas) and colonisation of Cape Verde and the three provinces southern to Morocco, you will set Portugal back in colonisation of the New World. Soon you can have 4 colonists (2 from Exploration, 1 from Expansion and 1 from national idea) which would be a good advantage in colonisation race against Portugal and ultimate one against France and England (they usually do not choose Exploration/Expansion as one of the first ideas).
As an alternative to making Portugal an ally, you can use aggressive strategy and take also their home provinces in a set of wars. The culture is the same culture group, so these provinces would be definitely helpful. However this would cost you administration power points to make a cores as most of the provinces are higher-value. Also be aware of Portugal allies - England since the beginning and later probably Aragon as well (which may be still leading the personal union with Naples) - this coalition would be most probably able to destroy your navy if in war with you at once, however on land you should be superior to them. If you are able to crush Portugal down, you will get rid of the biggest colonisation rival.
  • Alternative approach to Portugal: Felipe II's way
Portugal can be a natural friend of Castile. In fact between 1550-1650 if you have a royal marriage with them and more than 100 positive opinion if Portugal has a regency council the event "The Portuguese Crown" would fire allowing Spain to either vassalize or inherit Portugal.


Dominating the Seville trade node is a great way to earn a lot of money. Since Seville is an end trade node no trade can be steered away from it once there. So if Castile can control all provinces in the trade node no ships or trade buildings are needed in order to receive more cash from it, since no one will compete in an end trade node unless they have provinces there. This frees up a lot of ships for the Western Europe trade node instead. The important provinces to grab are, Lisboa and Porto from Portugal, Oran from Algiers and Tangiers from Morocco. Lisboa will probably be the last province to fall in Castilian hands, but Porto could be the first, after Azores and Madeira that is. Oran and Tangiers could be grabbed early, before Portugal or any other power may get a chance to take them.


Generally speaking, a simple and solid strategy for Castile is to merely colonize. It is in a powerful position to also stymie the rest of Europe from attempting to do so themselves. If the player wishes to pursue this, there are a few good locations to go after.
  • Cape Verde
Cape Verde is off of the West African Coast, and is key to early exploration of South America. Note that if the first African colony after Morocco is taken, it will also slow down Portugal as the small country must wait to expand their colonial range.
  • Africa
Sierra Leone is good to take early on as Castile will need a boarding country to get a CB in order to attack Mali, if they wish (see next section). Another option is to get good relations with Mali and instead get fleet basing rights to enable Castile to colonize around Africa. With a continued mix of fleet basing rights and good colonies, it should be managed well until the spice islands, which may be taken advantage of there.
  • Mali, Gold Mines
In Mali, there are some gold mines. These will be very useful for Castile. The player should avoid getting them until at least 3 missionary strength is acquired, but afterwards, it could be very beneficial to take the gold mines. Despite that, keep in mind that there is now a 'Financial Ruin' event caused by inflation from the gold. It fires when you have more than one gold province, and results in -1000 gold and -3 stability, so make certain that Castile will have enough loans to cover it. After recovery has occurred, the event will not happen again.
  • Swahili, Gold Mines
There are more useful gold mines in Swahili as well. As these are acquired, it may become useful to get an adviser which reduces inflation.
  • Formosa

Strategic island and valuable porcelain resource.