“The world will not come to an end,” said the Prophet Muhammad, “ until a man from my family (Ahlul Bayt) and of my name shall be master of the world, When you see a green ensign coming from the direction of Khorasan, then join them, for the Imam of God will be with the standards who will be called al-Mahdi.”
“The Mahdi will be descended from me, he will be a man with an open countenance and a face with a high nose. He will fill the earth with equity and with justice, just as it has been filled with tyranny and oppression.” (Biharul Anwar, Majlisi)
Imam Mahdi (as) , the last in the line of the Twelve Ithna Ashari Imams was born on 15th Shaban 255 Hijri in Samarra, Iraq. His father was the Eleventh Imam Hasan al-Askari (as) and his mother was Nargis Khatoon, granddaughter of the Emperor of Rum.