In that region, the Islamic Arabs left behind the Nubian genealogies of the inhabitants and claimed Qurayshi lineage, with their sheikhs saying they were Abbasids. They trace this lineage to one of the Ja'ali leaders mentioned in historical accounts, who founded the Islamic Emirate of Taghli. This emirate contributed to the spread of Islam and Arab culture in those areas, playing an active role, so much so that the inhabitants of those regions began speaking Arabic fluently. In fact, their Arab Islamic life and the spread of Islamic sciences and Arab culture became a replica of the Islamic cultural powers in northern Sudan. On this basis, Islamic and Arabic sciences permeated all parts of the vast Sudan, throughout the north, the equatorial forest regions, and the mountainous areas. All these regions were molded by this Arab Islamic culture, which left its mark on all branches of scientific, religious, and Sufi life. Consequently, interest in Arabic Islamic studies emerged. This interest in Arabic and Islamic studies was accompanied by a great passion for all books of Islamic and Arabic knowledge that were spread in Egypt and the Islamic world. This was especially true for those students who traveled in search of knowledge to various countries. Egypt was among the first countries where many Sudanese students arrived. In the 15th century AD (9th century Hijri), Egypt was a center of knowledge, thought, culture, and established scientific life in the Islamic world. It was indeed the Kaaba of knowledge, culture, and Islamic studies, to which students of Islamic knowledge flocked. The sons of Sudan found what they sought in this Islamic stronghold, Al-Azhar Al-Sharif. Al-Azhar was a destination for pioneers and scholars from all over the Islamic world who laid the foundation for the deep cultural and Islamic character of these Sudanese lands, which were imprinted with the Arab Islamic character and practiced it on a wide scale. The educated segments of the Sudanese people were able to embody various aspects of Islamic sciences and then focused their activities on summarizing, explaining, or composing works in their style. The first three centuries (9th Hijri century – 11th Hijri century) were the centuries of the beginning of the spread of Arab culture.