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The original was posted on /r/eu4 by /u/RaidersofLostArkFord on 2025-06-30 09:31:11+00:00.

I have recently started playing Aragon. I am trying to get the Mare Nostrum achievement. My first attempt failed, I am now trying a second time.

But regardless of me being bad, this country is actually OP if you have all the DLC’s. You can no-CB Byzantium early, then get Castile thanks to the Iberian Wedding, and then you have a mission that allows you to get a PU casus belli against PORTUGAL. Portugal is usually only allied with England, so you have a trivial war against them. These two PU’s, combined with Naples, allow you to create a massive vassal swarm.

Aragon is close to Italy and is located in Iberia, so both Renessaince and Colonialism should spread without devving your provinces up. Global Trade may also be easy. This makes it tremendously easier compared to something like Poland, who have to dev their provinces up.

Last but not least, Aragon allows you to colonize the New World WITHOUT having to take Explo/Expan ideas. Some 5 to 6 years ago, when I played this game on earlier patches and without most of the DLC’s, your PU’s wouldn’t colonize, but this has apparently been changed. Now, as Aragon, you are going to have Portugal and Castile colonizing massive swaths of land in the New World FOR YOU, FOR FREE. And once you annex them, you get all of these colonies, and if they are above 9 provinces, you presumably also get extra merchants.

With all that in mind, can we say Aragon is MASSIVELY more powerful than Castile? Why do you think people still talk more about Castile as one of the most powerful countries in the game and not Aragon?