And thus, the prevailing school of thought in those lands became the Maliki school of thought, although the dominance of this school does not negate the existence of some Shafi'is and Hanafis in the country. This is because there is no doubt that the spiritual unity born from the unity of Islamic rites among all these peoples who inhabited those places had a far-reaching impact on the life of the Sudanese people, because all of this was undoubtedly a strong impetus that aroused in the Sudanese people a great sense that they were a cohesive force on the one hand, and that they were part of a much larger and higher Islamic entity than the narrow borders of their country on the other hand. Arab Islamic culture in Sudan was influenced during that era, which witnessed the establishment of those Islamic sultanates, by two prominent factors in the history of the Islamic cultural movement. This Arab Islamic culture took its first step when the migrating Arab tribes set foot on Sudanese land in the third Hijri century, the sixth AD, where the invasion carried out by Abdullah bin Abdul Rahman Al-Amri in 255 AH left its first imprints in the spread of Arab Islamic culture, as Islamic cultural activity increased. If this Arab principality had been able to play its role in northern Sudan, the face of Islamic cultural life in that Arab Islamic country would have changed long ago. However, there are some views that imagine that cultural life did not crystallize clearly until the 15th century AD, the 9th Hijri century, and that it did not appear in a clear Islamic form until the 16th century, when the features of Islamic life began to appear and diversify with the dawn of the 17th century AD. Similarly, the Islamic cultural movement was influenced by Sudan's geographical location, which placed it between Islamic environments where the foundations of culture were consolidated.