margaret theresa of spain

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Prognathism is well recorded as a trait of several historical individuals. The most famous case is that of the House of Habsburg, among whom mandibular prognathism was a family trait; indeed, the condition is frequently called “Habsburg Jaw” as a result of its centuries-long association with the family. Among the Habsburgs, the most prominent case of mandibular prognathism is that of Charles II of Spain, who had prognathism so pronounced he could neither speak clearly nor chew as a result of generations of politically motivated inbreeding.