Then we agreed with the opinions of Ibn Hazm al-Zahiri and the opinions of the Mu'tazila. As for the third chapter, we discussed in it the influence of Ibn Tumart and his opinions in the Maghreb, and the influence in usul al-fiqh, and the influence in creed, politics, and society. In the first chapter, we focused on the establishment of the Almohad state as a result of the Mahdi's call. We highlighted the characteristics of this state, which are related to the influence of Ibn Tumart. We explained what the Almohads were characterized by in terms of love for knowledge and their pursuit of it, and their efforts to spread it. We also explained the religious character of Almohad politics. We concluded the chapter by mentioning some of the negative effects that appeared in the Almohad rule, related to some of the Mahdi's opinions, characteristics, and positions, such as harshness and autocracy. In the second chapter, we elaborated on the influence on creed, explaining the influence of the Mahdi's opinions regarding the Mahdism. We mentioned the acceptance of this creed after the Mahdi, and the opposition and rejection that arose in response to it, whether among the rulers, scholars, or the general public. We concluded with the eventual disappearance of this creed in the Maghreb. Then we discussed the Ash'ari influence of the Mahdi, explaining his fundamental role in introducing Ash'ari thought to the Maghreb and consolidating it there, particularly by explaining the popularity of his treatise "Al-Murshida" among the people of the Maghreb and its influence on shaping their creedal perception. We concluded this chapter by mentioning the role of the Mahdi's intellectual methodology in the growth of intellectual sciences in the Maghreb. In the third chapter, we explained the influence of the usul methodology that Ibn Tumart advocated on legal thought in the Maghreb, first by showing the attention given to usul, the Quran and Sunnah, and the development of the jurisprudential methodology that flourished during the Almohad era. It included serious attempts at jurisprudential foundation as an alternative to the branch-based methodology that prevailed during the Almoravid era, and it also included a lively and fruitful dialogue between