Their activity and rule merged in the year 750 AH. South, where Nubia is, and that Hence the integration of the Banu Kanz into Nubia was a prelude to the rapid spread of Islam. More than that, they participated in the events of the Christian Nubian kingdom, then established themselves through intermarriage with the Nubian royal house in Dongola, and their prince, Kanz al-Dawla, claimed the throne of Nubia by inheritance from his mother. Similarly, Saladin's reliance on Nubian soldiers and their replacement with loyal elements from the Kurds, Turks, and Daylam led to the migration of these Sudanese forces who had served in the Egyptian army throughout the Tulunid, Ikhshidid, and Fatimid eras, back to their homeland in Nubia. This had a clear, strong, and effective impact on the widespread dissemination of Islam and Arabism, as these numbers were so large that they affected the entire society, extending their influence to central Sudan and to the area currently known as the Gezira region, where the city of Soba is located. Similarly, the Fatimid control, as we have previously mentioned, over the port of Ghaydub and its adoption as the optimal port instead of the port of Qulzum (Suez) left the Christian Nubian state in Dongola without maritime outlets to the outside world, which meant the Islamic state blocked their path, especially to the holy Christian sites in the Levant (Palestine), as well as trade with the outside world. This made them subject to the mercy of Egypt and the Muslims, as the only port of Sudan, Ghaydub, was under Muslim control. Furthermore, this Islamic control led to the spread of Arabs in the Eastern Desert. From here, the Muslims tightened their siege on them and isolated them from the outside world during the Ayyubid era, especially after the victory over the Crusaders in Palestine during the reign of Saladin al-Ayyubi, after his victory over them in the Battle of Hattin. Although the known sources of that time, such as Ibn Shamma, Al-Nuwayri, Ibn Khaldun, and others, do not indicate any relations between