Ali ibn Husayn, also known as Zayn al-Abidin and Imam as-Sajjad was the fourth imam in Shia, Islam. He was the son of Husayn ibn Ali and the grandson of Ali ibn Abi Talib. He survived the Battle of Karbala and was taken to the caliph in Damascus. Eventually, he was allowed to return to Medina. His life was devoted to spiritual and religious teachings, mostly in the form of prayers and supplications. His famous supplications are known as "As-Sahifa as-Sajjadiyya".