One of the strongest factors that led people to rally around Al-Mirghani and his followers was their firm belief that he was from the Prophet's household and a part of the Messenger of God (peace be upon him). All these factors combined led to the great success achieved by Al-Mirghani in Sudan, and to the enrollment of the majority of Sudanese in the Khatmiyya Tariqa, the new and incoming order. After the death of Muhammad Uthman Al-Mirghani, the leadership of the Tariqa passed to his eldest son, Muhammad Sir Al-Khatm. The Tariqa branched out into four regional branches, and the region of Sudan fell to Sayyid Muhammad Al-Hasan.

Sayyid Muhammad Uthman Al-Mirghani, known in Sudan as Sayyid Al-Hasan (Abu Jallabiya), was born in Bara, Kordofan, in March 1800 AD, corresponding to 4 Jumada II 1214 AH. In 1801 AD, Al-Hajj Idris wad Jallab, accompanied by his mother Ruqayya bint Jallab, his sister Ruqayya, and his nephew Muhammad Al-Hasan, traveled to the Hijaz. There, they met Sayyid Ahmad bin Idris, who prayed for blessings upon Al-Hasan. This was done at the request of Sayyida Ruqayya, Muhammad Al-Hasan's mother. After a period, they returned to Bara. In 1813 AD, Al-Hasan traveled to Mecca to meet his father. There, he began studying the Quran under a sheikh from Medina and learned Islamic sciences from his father. He also learned from a woman who had studied under his grandfather, Sayyid Abdullah Al-Mahjoub. Sayyid Al-Hasan engaged in continuous Sufi practices and spent part of his time in Medina, near the Prophet's tomb (peace be upon him). His long absence in Medina caused his father concern, so he called him to return. After that, he traveled with his father to Suakin, then to Mecca. His father, Al-Hasan, asked him to return to Mecca. There, his father ordered him to travel to parts of Sudan to spread the Khatmiyya Tariqa, representing his father. Al-Hasan toured the regions where Muhammad Uthman Al-Khatm had established disciples and followers. He visited Berber, where he was received with great fanfare by his father's followers, which caused concern and apprehension for the governor.