Question: Who is Hujjat-Allah Al-Mahdi's mother?
Sentence (from "Hujjat-Allah al-Mahdi"): Twelver Shias believe that al-Mahdi was born on the 15th Sha'ban 879 CE/ 255AH and assumed Imamate at nearly 5 years of age following the killing of his father Hasan al-Askari.
Relevant evidence: Yes