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In page Chartres Cathedral:

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By the end of the 12th century, the church had become one of the most important popular pilgrimage destinations in Europe. There were four great fairs which coincided with the main feast days of the Virgin Mary: the Presentation, the Annunciation, the Assumption and the Nativity. The fairs were held in the area administered by the cathedral and were attended by many of the pilgrims in town to see the cloak of the Virgin.[citation needed] Specific pilgrimages were also held in response to outbreaks of disease. When ergotism (more popularly known in the Middle Ages as "St. Anthony's fire") afflicted many victims, the crypt of the original church became a hospital to care for the sick.[5]