Sabur al-Amirí was a Andalusian ruler of possible Slavic origin who started out as a slave and rose to be the governor of Badajoz. When the Caliphate of Córdoba collapsed, Sabur established a Taifa in Badajoz and excercised control over the entirety of the former Roman province of Lusitania. In our timeline, Sabur died and his two underage sons were muscled out of power by the Aftasí dynasty. What if Sabur lived longer, a son of his was able to take over, be relatively competent, and were able to kick Caliph Al-Qasim al-Ma'mun ibn Hammu out of Córdoba?
Essentially, what if a Taifa ruler was able to unite the fractured Muslim states of Al-Andalus in the early to mid 11th century?