And liberate Jerusalem from the heathen!  Take your swords, mount your horses and place the crusader cross on your cloak!  TO JERUSALEM!!!  Oh, P.S. if you want to do some raiding and pillaging on the way, your plenary indulgence will take care of that once you kill a few paynim.  This offer is still good even if the ones you kill are weird so-called Christians in Constantinople.  Lots of good loot there too, and of course relics to enrich out churches back home!