Hmm .. depends if its on the AI spell list, what it most likely isn't. Or it will try to cast it from a lab, but it uses only the lab in the home province - and there's a castle already present... .
Write a small mod, test it
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As for AI the most effective work around to this problem so far is to simply use an American instead, they tend to put up a bit more of a fight than your average Artificial Idiot. ... James McGuigan on rec.games.computer.stars somewhen back in 1998 ...