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Have ships on anti pirate patrol all the time, keep all the pirate countries in range as allies, or conquer all there coastline/help a non pirate country conquer it.
As a half solution, having forts in pirated areas makes negative effects wear off relativley fast.
Just to be clear, forts arent realy worth it at all, so thats why I said its a half solution. Still, if its a fort in one of the many mountain provinces in Iberia and if you want to keep it anyway, it will help in regards to pirating.