Yusuf b. Tashfin was the champion now invited by the Muslims of Spain, not without misgivings in many quarters, but the choice seemed to lie only between Christian or Berber, and the Berbers were at least of their own religion and of the same race as the majority of the Spanish Muslims. Yusuf came as a helper, but a second time invited he stayed on and established his authority over the country, and thus Spain became a province under the rule of the Murabit princes of Morocco. Yusuf was succeeded by `Ali, who was successful in restraining the Christians, and at one time even formed plans to drive them out of Spain altogether. Murabit rule, which lasted 35 years, brought many changes and itself experienced many changes. The rulers were rough men of uncouth manners and fanatical outlook. Not many years before, it will be remembered, the Arabs of Kairawan were reluctant to venture into their land, such was their ill repute. They were partially humanised by a religious movement, and thus naturally show a religious character which bordered on fanaticism. `Ali himself was entirely in the hands of the _faqirs_ or mendicant devotees and qadis, and the government was liable to interference from these irresponsible fanatics at every turn. It was a state of affairs which awakened the impatience of the cultured Muslims of Spain, who expressed their feelings in many caustic epigrams and satirical poems. But very soon a change began to work. The Murabits and their followers did not become less attached to the devotees, who swarmed unchecked on every side and received idolatrous attentions from the multitude, but they learned the luxuries and refinements of the cultured life then prevailing in Spain and showed themselves apt pupils. Indeed, their downfall may be explained either as due to effete luxury or to faqir-ridden superstition, as we shall see later on. The intellectual life of Muslim Spain up to the Murabit period was conservative rather than backward. Its literary men were nearer the old traditional Arab type than was the case in the eastern Khalifate, where Persian influences had pushed the Arab so much into the background; its scholars were still occupied exclusively with the traditional sciences, exegesis, canon law, and traditions. The Murabit invasion offered a stimulus to satirical verse, but otherwise did nothing to promote either literature or science. Yet it is under Murabit rule that we find the first beginnings of western philosophy, and the line of transmission is from the Mu`tazilites of Baghdad through the Jews and thence to the Muslims of Spain. The Jews act as intermediaries who bring the Muslim philosophy of Asia into contact with the Muslims of Spain.