The Crusades began with great ideals of protecting pilgrims in the Holy lands and fervor for the Crusade was quickly put together across the Royal courts of Europe, particularly France and Germany by hermits and monks. The desire to please the Pope in Rome, probably was connected more with indulgences, such as prayers for dead ancestors transit from purgatory to heaven.
Meanwhile the Pope wanted to unify Europe and bring both the Roman Catholic Church and nations all under his one umbrella of power.