Before the final Day of Judgement of the world, there will be a period of time when there will be injustice and atrocity everywhere. An offspring from Sayyada Fatima-tuz-Zahra’s(A.S.) will come.
Sahib al Asr waz- Zamaan, Al-Hujjat, Al-Qaim, Al-Muntazir, Al-Muntazar, Mauood, Imam-e-Asr, Baqiyatullah are the titles of Imam Mahdi.
In Shia Islam, Imam Mahdi is the 12th Imam. Imam Mahdi was born on the 15th of Shaaban 255 AD in Samarrah and he is alive, Alhamdulillah but is in occultation by the will of Allah. There are two phases of occultation: the minor occultation Ghaibat-e-Sughra – 8th Rabi-ul-Awal 260 AH (872 AD) and the major occultation Ghaybat-e-Kubra – 10th Shawwal 329 AH (939 AD). The major occultation is ongoing and is expected to continue until the Mahdi’s reappearance. Father of Imam Mahdi is Imam Hasan-al-Askari(A.S.)11th imam and his mother is commonly known as Janab-e-Narjis Khatoon (S.A) in Islam.
He will promote the justice in the whole world. Shia islamic scholars say that all their community is waiting for their leader who will do justice in the world.
Imam Mahdi will be commonly known as Imam Mehdi or Imam Mahdi(A.T.F.). The term al-Mahdi was employed from the beginning of Islam. Imam Mehdi is commonly known by few names like Muhammad Ibn-e-Hasan Askari, Aakhri Hujjat, Imam Mahdi, Imam-al-Mehdi, the Awaited Mahdi and many more. The Beloved Rasool has said in a blessed Hadees that he will rule for seven 7 or nine 9 years on the world.