Some cities in Iraq and cities in Persia that contained important scientific centers. And some of the famous sheikhs, increasing his knowledge and learning. It is also not unlikely that the period was long, and his presence in the East was an opportunity for him to perform more than one pilgrimage. We only find a small amount of information about the sheikhs he studied under and the sciences he studied. This makes us resort to inference and deduction, trying to determine the type of sciences he received, and the intellectual framework he benefited from his sheikhs from the few indications that have been mentioned. Ibn Khaldun mentioned a general formula in his mention of Ibn Tumart's sheikhs in the East without specifying their names, saying: "He entered Iraq, met a group of scholars and debaters, and benefited greatly." But other historians mentioned some of the famous scholars in Baghdad, and it is clear that these were none other than the prominent professors of Al-Mahdi. There is no doubt that he studied with many others who were less famous than them. Nevertheless, there is disagreement among some of those whose names have been mentioned regarding his tutelage and connection with them, which requires further investigation and verification for each one of them. Those whose names have been mentioned are: Abu Hamid Al-Ghazali, Al-Kiya Al-Harasi, Al-Mubarak bin Abdul Jabbar, Abu Bakr Al-Shashi, Abu Bakr Al-Tartushi, and Abu Abdullah Al-Hadrami. Abu Hamid Al-Ghazali: A fierce debate has arisen among historians as to whether Ibn Tumart met Al-Ghazali directly and studied under him, or if that did not happen. The magnitude of this disagreement reflects the importance of this meeting in terms of the profound impact it could have had on Ibn Tumart's scientific and intellectual personality, given the vast knowledge of Hujjat al-Islam and his critical thought that influenced Islamic thought in general. For the same reason, Ibn Khaldun, Al-Ibar: (42) 73