Muhammad Al-mahdi Al-hujjah

Also called �Muhammad Al-muntazar, Hidden Imam, or Twelfth Imam� (disappeared 878), 12th and last imam, venerated by the Ithna 'Ashariyah, or Twelver sect, the main body of Shi'ite Muslims. It is believed that Muhammad al-Mahdi al-Hujjah has been concealed by God (a doctrine known as ghaybah, or occultation) and that he will reappear in time as the mahdi, or messianic deliverer. See also Ithna 'Ashariyah.