You could aks why most of the Crusaders were from Western Europe rather than those lands most in contact with the Muslim world (logically that would stirup the most zeal to fight the enemy). What was it in Byzantiumthat was different than in Western Catholicism that did not promote a Crusading Zeal.

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Pergamum


"If a commission by an earthly king is considered a honor, how can a commission by a Heavenly King be considered a sacrifice?"
-- David Livingstone