Quickest collapse you've seen?

[The Unknown Guy]

I don´t remember reading that in the manual. I thought it only applied to "Generals of Royal Blood" AKA: former princes out of the succession line. Which I know to take place not for personal experience, but because I murdered several "heirless" kings of Sicily, and some remaining "royal knights" became kings over and over. In fact, I had to çuit my friendly face and invade them straight off, instead of just buying off Malta.