Beginning with Isa, members of the Al Fadl became the hereditary holders of the office of amir al-ʿarab (commander of the Bedouin) on behalf of the Mamluk Sultanate.
[1][2] Though Fadl appeared to oppose Muhanna's defection, the 14th-century Arab historian, al-Umari, noted that the two brothers cooperated in playing the Mamluks and Ilkhanids off of each other for their own interest.
The following year, Fadl visited Abu Sa'id, the son and successor of the Ilkhanid ruler Öljaitü, to give him a present of Arabian horses in Baghdad.
[4] During a visit to Salamiyah in 1324, it was apparent that Muhanna still held sway with the Bedouin in Syria while Fadl was the nominal emir who received a government salary.
[4] In 1328, Fadl gave Muhanna's son Sulayman substantial sums after the latter defected from the Ilkhanids and agreed to submit to Mamluk authority in al-Rahba.