What were the effects of the Crusades on Romanesque art and architecture?

The influence of the Crusades can be seen in the Mission of the Apostles from the Vezelay tympanum.

Vezelay was closely associated with the Crusades. Urban II had intended to preach the launch of the First Crusade at Vezelay. Bernard of Clairvaux called for the Second Crusade from Vezelay, and the Third Crusade was started at Vezelay. The iconographic implications of the tympanum, itself could read as a mission of the "apostles" in the guise of the crusaders who would bring Christianity to the Infidel.

See pages 440-443 in the Gardner's AP Art History text book