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https://paginasarabes.com/2017/12/09/al-nasir-%e1%b9%a2ala%e1%b8%a5-ad-din-yusuf-ibn-ayyub-sultan-de-egipto-y-siria/
Al-Nāsir Ṣalāḥ ad-Dīn Yūsuf ibn Ayyūb sultán de Egipto y Siria