The Fatimid in Egypt. This is because when the Fatimids conquered Egypt, they found this prosperous principality on the Egyptian-Nubian borders. They did not interfere with it but left it to its own devices and recognized it. It extended its authority over some of the regions of Upper Egypt and perhaps its borders reached south of the city of Qus, which was the capital of the southern Upper Egypt region from the beginning of the Fatimid era and remained so until the 19th century AD, where it was an important commercial market to which traders from all nations came, in addition to the arrival of pilgrims during the Hajj season. In addition to the northern part of the al-Maris region, it was under the influence of Banu Kanz, whose descendants are still spread today throughout Upper Egypt and Nubia, especially the al-Maris region, where they still maintain their Arab traditions.

Relations with the Caliphate: The Fatimid Caliphate's recognition of the Banu Kanz emirate before the capture of Abu Ruqwa was due to the fact that this Islamic emirate was an extension of the Islamic expansion southward. This is because this Arab Islamic principality, located on a large part of the Christian Kingdom of Nubia and on the southern borders of Egypt, served as a dividing line between Islamic Egypt and the Christian Kingdom of Nubia. It was even their first line of defense, as it protected them from the attacks and raids of the Nubians and the Beja, of which the Fatimids were not unaware since they set foot on Egyptian soil. It was also due to the Fatimid Caliphate's focus on spreading its influence in the Islamic East and working to combat the Abbasid Caliphate.

In addition, this Arab Islamic principality prevented raids by the Beja on Egypt since its establishment. The evidence for this is that we did not hear of any Nubian raid or retaliatory raid carried out by these people throughout the Fatimid era. We also did not hear of raids or attacks led by the kings of Nubia or their subjects, which were raids they used to carry out whenever they felt Egypt was weak, except at the end of 132