I looked through the anciliary file and noticed that all relics are transferable (holy grail, true cross, etc) and all give +piety and 1 or 2 other bonuses. Not only that, you can earn them pretty consistently - just conquer a certain city with a high piety (6 or more) general. 50 percent chance to get, 75 if on crusade. Almost every city in the middle east yields a relic, also constantinople, milan, paris, hamburg, and bordeaux. If you dont get it first time, let the city go rebel and try again. When you have a few of these, let your prince have them, build a church or 2 and join a crusade. Bam, max piety
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