Sayf ad-Din Baybugha Rus al-Qasimi an-Nasiri (also known as Baybugharus or Aurus) was a prominent Mamluk emir during the reigns of sultans as-Salih Isma'il, al-Muzaffar Hajji, an-Nasir Hasan and as-Salih Salih.
[2] He is first mentioned by Mamluk-era historians during the reign of an-Nasir Muhammad's son, as-Salih Isma'il.
[1] During the reign of the latter's brother and successor, al-Muzaffar Hajji, Baybugha became the amir majlis (lord of the audience),[1] a relatively high-ranking office which was responsible for overseeing the sultan's physicians and oculists.
The latter freed Baybugha and appointed him na'ib (governor) of Aleppo in 1351,[1] replacing Emir Arghun al-Kamili.
[7] The latter responded by leading a military expedition against the rebellious emirs, and he succeeded in arresting Baybugha, along with the nuwab (governors) of Safad, Hama and Tripoli.