The situation became worse for Byzantium during the civil wars after Andronikos III died. A six-year-long civil war devastated the empire, allowing the Serbian ruler Stefan Dušan (r. 1331–1346) to overrun most of the Empire's remaining territory and establish a Serbian Empire.
Al-Malik al-Mansur Sayf ad-Din Abu Bakr, better known as al-Mansur Abu Bakr was the Bahri Mamluk sultan in 1341. He became sultan, the first of several sons of an-Nasir Muhammad to accede to the throne. However, his reign was short-lived.