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Many Persian rugs feature inscriptions within a cartouche, often revealing the name of the commissioner, the artist, or the factory and year of creation. These inscriptions typically use the Hegira calendar rather than the Iranian calendar. To convert a Hegira date to the Christian era, subtract 3% of the inscribed date and add 622. The Hegira calendar begins with the Prophet Mohammed’s migration from Mecca, marking the start of the Islamic calendar.