I made my first stupid mistake today. I fabricated a claim on Tangiers, but when I got it, it turns out that didn't mean I'd get a core on it. I should've known that. But Tangiers has "berber traditions", which means coring it costs +200% admin power.
Oops.
In other news: what's the opposite of subjugation? I think this war will be known henceforth as the First Aragonese Superjugation War.