 However, due to the Berber revolt the Umayyad governors were forced to protect their southern flank and were unable to mount offenses against the Asturians.Some presence of Berbers in the northwest may have been maintained at first, but after the 740s there is no more mention of the northwestern Berbers in the sources.When the Umayyad dynasty was overthrown in 750, a grandson of Caliph Hisham, Abd ar-Rahman, escaped to north Africa.