I'm playing as Spain right now and who knew that it would be this hard Moors are every where, ImaNNNNs, and unrest, I have small army of spies and assassins running around every where "NIGHT MARE" Now all of a sudden Rebels are pop, pop, pop all over my lands and i'm at war with France, Moors, and on the verge of EXCOM from my own pope!!!! But yes rebels are a necessary evil they give are Generals ****** and who can pass up "Man of the hour" no matter how many turns and Capt. you fight with. You will have to hunt them down and kill them all/all of the time I only use forts in choke points or when I want to re rout an enemy army. Watch towers are ok but I rarely use them only early in a game or on my most frontal boarders. To my knowledge I have never known either to stop the spawning of rebels.