When conquering Jerusalem on own account (not at request of the pope via an crusade) at least a note of gratitude for taking the holy city from non christians, or to show more of his apprisiation for such accomplisment, maybe some extra piety or gold would be nice.
As well starting maybe a series of events when taking the city; such as, to convert to christianity, to kill all non christians in the city (historically seen the crusaders did do something like it, right?), maybe retrieve holy abjects to rome or home capital as souvenir![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
As well starting maybe a series of events when taking the city; such as, to convert to christianity, to kill all non christians in the city (historically seen the crusaders did do something like it, right?), maybe retrieve holy abjects to rome or home capital as souvenir