Hazrat Imam al-Mahdi (A.S.) is the twelfth and last of the chain of the Purified Imams and the divine successors (A.S.)he was born at the time of dawn on Friday the 15th of Shaban 255 A.H. in the city of Samarrah. (Kamaaluddin vol. 2, Pg. 428, 433 424, 430) His respected father is Imam Hasan al-Askari (A.S.), his beloved mother is Janab-e-Nargis Khatoon (r.a), she was in the side of her father from the descendant of Caesar of Rome and descendant of Shamoon the vicegerent of Hazrat Isah (a.s) in the side of her mother. "Kamaaluddin vol.2 Pg. 420, 424,"