I fought 3 crusades in the east, taking jerusalem, antioch and acre, the general who led all of them was a living saint and a grand crusader and any number of other good things. even when not in a city i could maintain minimal garrisons and continue to carve out an eastern empire. i noted the glory bonus and the effects of religion seemed to be lessened, he finally died of old age, and lo and behold, antioch and jerusalem immediately revolt...

i can only assume that 'Glory' might be related to a single character, and when he dies, you lose the bonus