 Relations between Isa and the state were generally cooperative with few exceptions , and he participated in nearly all Mamluk military campaigns against the Mongol Ilkhanate . Toward the end of his reign , in 1281 , Isa received the oasis town of Palmyra as additional iqtaʿ from Sultan Qalawun . His son Muhanna ibn Isa succeeded him following his death in 1284 . Muhanna and his brother Fadl ibn Isa , who served as amir al @-@ ʿarab in between Muhanna 's dismissals , vacillated between the Mamluks under Sultan an @-@ Nasir Muhammad and the Ilkhanate between 1311 and 1330 . Afterward , the Al Fadl became firmly part of the Mamluk camp . An @-@ Nasir Muhammad particularly lavished the Al Fadl emirs with iqta 'at , gifts and honors to the extent that Muhanna criticized the policy as over @-@ indulging the Bedouin , and in the process , weakening the Muslim army . The imarat al @-@ ʿarab remained in the hands of Isa 's household , particularly the direct descendants of Muhanna ( Al Muhanna ) , through the remainder of Mamluk rule ( 1260 – 1516 ) with brief interruptions during which emirs from Al Ali held the post . By 1352 , Al Muhanna numbered 110 , all of whom held their own emirate and iqta 'at . According to Mustafa A. Hiyari : 
