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Seljuk Turks killed 3000 Christian Pilgrims which started the first crusade. It was called the people's crusade and was led by Peter the Hermit. They didn't take back the holy land, most of them died.
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The city of Edessa was taken by the Turks, and the entire population was slaughtered, or sold to slavery. It brought Western Europe to the danger which threatened the Latin Kingdom of Jerusalem and led to another crusading enterprise. It was a failure and they lost the Holy Land.
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Pope Urban started the Fourth Crusade. The leaders of the Fourth Crusade wanted Egypt to be their objective point. They wanted Eygpt because it was the center of Moslem power. When the Fourth Crusade was over Constantinople lost strength and couldn't cope with the barbarians. 200 years later they were captured by the Turks.
