As the others have said, give him the Bishopric of Roma, but not the actual county.
The Pope doesn't need high moral authority to call a crusade (just 5%), but he does need to be landed.
Giving him the actual county will make it less likely that a crusade ends prematurely (if the Ummayads stomp over to Rome and get 100% warscore by taking his only holding), but is otherwise not useful for anything.
The Pope doesn't need high moral authority to call a crusade (just 5%), but he does need to be landed.
Giving him the actual county will make it less likely that a crusade ends prematurely (if the Ummayads stomp over to Rome and get 100% warscore by taking his only holding), but is otherwise not useful for anything.