Beyond the chain of Mount Atlas, in the deserts of ancient Getulia, dwelt two tribes of Arabian descent--both, probably, of the greater one of Zanhaga, so illustrious in Arabian history. At what time they had been expelled, or had voluntarily exiled themselves, from their native Yemen, they knew not; but tradition taught them that they had been located in the African deserts from ages immemorial. Their life was passed under the tent; their only possessions were their camels and their freedom. Yahia ben Ibrahim, belonging to one of these tribes--that of Gudala--made the pilgrimage of Mecca. On his return through the province of Cairwan he became acquainted with Abu-Amram, a famous _alfaqui_, originally of Fez. Being questioned by his new friend as to the religion and manners of his countrymen, he replied that they were sunk in ignorance, both from their isolated situation in the desert and from their want of teachers; he added, however, that they were strangers to cruelty, and that they would be willing enough to receive instruction from any quarter. He even entreated the alfaqui to allow some one of his disciples to accompany him into his native country; but none of those disciples was willing to undertake so long and perilous a journey, and it was not without considerable difficulty that Abdallah ben Yassim, the disciple of another alfaqui, was persuaded to accompany the patriotic Yahia. Abdallah was one of those ruling minds which, fortunately for the peace of society, nature so seldom produces. Seeing his enthusiastic reception by the tribe of Gudala, and the influence he was sure of maintaining over it, he formed the design of founding a sovereignty in the heart of these vast regions. Under the pretext that to diffuse a holy religion and useful knowledge was among the most imperative of duties, he prevailed on his obedient disciples to make war on the kindred tribe of Lamtuna. That tribe submitted, acknowledging his spiritual authority, and zealously assisted him in his great purpose of gaining proselytes by the sword. His ambition naturally increased with his success: in a short time he had reduced, in a similar manner, the isolated tribes around him. To his valiant followers of Lamtuna he now gave the name of _Muraditins_, or _Almoravides_,[30] which signifies men consecrated to the service of God. [Footnote 30: This Moslem dynasty, founded about 1050, ruled in Africa, and afterward in Spain, until 1147, when it was overthrown and succeeded by that of the Almohades.]