Reappearance of Muhammad al-Mahdi

The reappearance of Muhammad al-Mahdi is the Twelver eschatological belief in the return of their Hidden Imam in the end of time to establish peace and justice on earth. For Twelvers, this would end a period of occultation that began shortly after the death of Hasan al-Askari in 260 AH (873–874 CE), the eleventh Imam.