A few were Arab and Berber Christians coupled with Muslim converts to Christianity who, as Arabic speakers, naturally were at home among the original Mozarabs. A prominent example of a Muslim who became a Mozarab by embracing Christianity is the Andalusian rebel and Anti-Umayyad military leader, Umar ibn Hafsun. The Mozarabs of Muslim origin were descendants of those Muslims who converted to Christianity following the conquest of Toledo, and perhaps also following the expeditions of king Alfonso I of Aragon. These Mozarabs of Muslim origin who converted en masse at the end of the 11th century, many of them Muladi (ethnic Iberians previously converted to Islam), are totally distinct from the Mudéjars and Moriscos who converted gradually to Christianity between the 12th and 17th centuries. Some Mozarabs were even Converso Sephardi Jews who likewise became part of the Mozarabic milieu.