 The conquest of Nubia was not permanent, however, and the process of invading the region and installing a vassal king would be repeated by Baybars' successors.Nonetheless, Baybars' initial conquest led the annual expectation of tribute from the Nubians by the Mamluks until the Makurian kingdom's demise in the mid-14th century.Furthermore, the Mamluks also received the submission of king Adur of al-Abwab further south.