 Following Hajji's death, the senior emirs of an-Nasir Muhammad hastily appointed another of his sons, the twelve-year-old an-Nasir Hasan.Coinciding with Hasan's first term, in 1347–1348, the Bubonic Plague arrived in Egypt and other plagues followed, causing mass death in the country, which in turn led to major social and economic changes in the region.In 1351, Hasan attempted to assert his executive power and was ousted by the senior emirs, led by Emir Taz, and replaced with his brother, as-Salih Salih.