What event in the thirteenth century influenced the Egyptian state's change in attitude toward its Christian subjects from tolerance to persecution?

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The Crusades, which began in the late 11th century and continued through the 13th century, had a major impact on the relations between Muslims and Christians in the Middle East, including Egypt. During the Crusades, European Christian armies invaded and attempted to conquer Muslim territories, including Egypt. As a result, Muslim rulers in Egypt became increasingly suspicious of their Christian subjects, who were seen as potentially sympathetic to the invading Christians. This led to a shift in the Egyptian state's attitude toward Christians, from one of tolerance to one of persecution.

What Event in the Thirteenth Century Influenced the Egyptian State's