Quote Originally Posted by Martok
Ah, I see what you're saying. I admit I don't think I knew that before. But then, I usually don't leave Crusade markers just sitting around either--at least not in a province that's vulnerable to attack. Under what circumstances were you unforunate enough to fall victim to this?
It´s a good idea though, you can even lift excommunitation if you have Crusade markers to spare.
Once I, as HRE, was excommunicated for waging war against the French. Then the Pope called for a Crusade, I took and finished it and was back in the loving embrace of the Church. And the French got excommunicated
However, I don´t know whether that works only with called-for crusades or crusades in general.

By the way, you can also check province loyality in the income screen.