Úmarth
Megalomaniac
Let me give you a short summary, the 1st Crusade was called after the Byzantines appealed to the Pope for assistance in staving off Islamic forces for CENTURIES.
True, but they very quickly forgot about aiding the Byzantines in favour of invading Arab Jerusalem and the 'Holy Land', which was the focus of all subsequent crusades (and the 4th crusade of course turned on their fellow Christian Byzantines and did what the Muslims never could: sack Constaninople).
Not that this has any relevance to the OP...