Hujjat Allah ibn al-Hasan al-Mahdi is believed by Shia Twelver Muslims to be the Mahdi, an eschatological redeemer of Islam and the final Imam of the Twelve Imams who will emerge with Isa in order to fulfil their mission of bringing peace and justice to the world. Twelver Shias believe that al-Mahdi was born on the 15th Sha'ban 869 CE/ 255 AH and assumed Imamate at nearly 5 years of age following the killing of his father Hasan al-Askari. In the early years of his Imamah, he is believed to have