I have banged on about this before. Here's someone with a lot more knowledge than me burying some of the usual myths about the Crusades (passed on recently by the dreadful Kingdom of Heaven). (via Wheat and Weeds)
He shatters 8 myths. The first.
Myth 1: The Crusades were wars of unprovoked aggression against a peaceful Muslim world.
This is as wrong as wrong can be. From the time of Mohammed, Muslims had sought to conquer the Christian world. They did a pretty good job of it, too. After a few centuries of steady conquests, Muslim armies had taken all of North Africa, the Middle East, Asia Minor, and most of Spain. In other words, by the end of the eleventh century the forces of Islam had captured two-thirds of the Christian world. Palestine, the home of Jesus Christ; Egypt, the birthplace of Christian monasticism; Asia Minor, where St. Paul planted the seeds of the first Christian communities: These were not the periphery of Christianity but its very core. And the Muslim empires were not finished yet. They continued to press westward toward Constantinople, ultimately passing it and entering Europe itself. As far as unprovoked aggression goes, it was all on the Muslim side. At some point what was left of the Christian world would have to defend itself or simply succumb to Islamic conquest.
(via Wheat and Weeds)