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imperium3

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Well, to paraphrase your signature: "Castille's problem with Aragon is the fact that they are still alive."

You can try and keep good relations through lots of gifts and royal marriages, but if they want you dead they will DoW regardless. A better bet might be to cosy up to someone like France, as an ally to bail you out. Or hope Castille gets into a big early war against someone like, again, France, then pounce on them before they can recover. Once the number of provinces is evened up a bit they might be less of a threat.
 

Richard-monagha

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As Imperium3 said you'd need a good ally that can match that of Spain and France if your best bet.

Also if you can try to ally yourself with Portugal should they ever lose thier alliance with England. Don't waste time allying with Portugal if they are allied with England as they will be at war with you/France when war is started.

You'd be fucked if Castille ally with Burgundy/England tho :p
 

Dale248

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I could try making some shifty alliances in my next game, but at the moment, i have been sexually violated by castille 4 times and they have only taken one province from me(valencia). They are leaving me alone for now so im heading east and conquering the small Mediterranean and Italian countries like Sardinia, Sicily, Naples ect... hoping to build up enough to take on or at least defend myself from castille.
 

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Salting the Earth I found was a good tool in my EU3 campaign as Aragon.
 

n0thin

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They usually won't attack you right from the start, as they will first mess with Granada and the Maghreb states. Use this. Despite Castille, Aragon has an awesome starting position. You have a core on Sardinia, a mission granting you cores for all of Sicily and a mission granting you cores on all of Naples (including everything they conquered, so you will be ending up with Epirus most times). All for little infamy. Then you can use your position in Italy to become stronger or can, if you're strong enough, wage war against the Ottomans for cheap 1-infamy-provinces. You can grow so fast while being really stable as Aragon, it's amazing.
Otherwise: Just keep relations with them high and try giving them maybe a royal marriage and most importantly military access. Or ally a mixture of France/England/Portugal/Burgundy and try simply killing them.
 

Dale248

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They usually won't attack you right from the start, as they will first mess with Granada and the Maghreb states. Use this. Despite Castille, Aragon has an awesome starting position. You have a core on Sardinia, a mission granting you cores for all of Sicily and a mission granting you cores on all of Naples (including everything they conquered, so you will be ending up with Epirus most times). All for little infamy. Then you can use your position in Italy to become stronger or can, if you're strong enough, wage war against the Ottomans for cheap 1-infamy-provinces. You can grow so fast while being really stable as Aragon, it's amazing.
Otherwise: Just keep relations with them high and try giving them maybe a royal marriage and most importantly military access. Or ally a mixture of France/England/Portugal/Burgundy and try simply killing them.

I didn't do Aragon's missions until after Castille attacked me. i shall try that approach
 

n0thin

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It's important to do it fast. So, kill Sardinia right at the start.
Then look for good ally opportunities like Venice, Portugal, Genoa or the likes. Navally strong middle powers with at least a bit of manpower behind them, that can interfere in the Mediterranean (Hansa or Holland won't help you much. Still better than someone like Bavaria ofc). Unally Sicily and punch them hard, annex with your mission.
Punch Naples right after, annex them as well with your special mission. As long as your navy + allied navies (but remember, allies are unreliable) have superiority over their & their allies navies, you should be able to do this relatively easy.
You should now be fairly strong, as long as Castille hasn't England or France as their ally, you should be fine, maybe even able to beat them one on one. PU'ing Castille would be incredibly strong, since you will get cores on inheritance. Same goes for Portugal.
You can however wait and look for other opportunities. Easy PU's are great. Especially if Bohemia is still HRE, you should be able to claim PU's over countries like Savoy or Milan. Another way to expand is the mentioned route into the Ottoman Empire, once you can beat them (blocking Bosporus with a superior fleet helps a ton here). Since you should get Epirus/Janina via the Annex Naples mission, you have a holy war casus belli and can therefore claim the relatively rich Greek and Turkish provinces for 1 infamy each.
If you follow the missions and then grab good opportunities, being the world's strongest power in 1500 should be certainly doable.