عبد الله بن ياسين
It is uncertain exactly when or why the Almoravids acquired that appellation. al-Bakri, writing in 1068, before their apex, already calls them the "al-Murabitun", but does not clarify the reasons for it. Writing three centuries later, Ibn Abi Zar suggested it was chosen early on by Abdallah ibn Yasin because, upon finding resistance among the Gudala Berbers of Adrar (Mauritania) to his teaching, he took a handful of followers to erect a makeshift "ribat" (monastery-fortress) on an offshore island (possibly Tidra island, in the Bay of Arguin). Ibn Idhari wrote that the name was suggested by Ibn Yasin in the "persevering in the fight" sense, to boost morale after a particularly hard-fought battle in the Draa valley c. 1054, in which they had taken many losses. Whichever explanation is true, it seems certain the appellation was chosen by the Almoravids for themselves, partly with the conscious goal of forestalling any tribal or ethnic identifications.