Ali Zayn al-Abidin was the son of Imam Husayn, the grandson of Imam Ali, and the great-grandson of Prophet Muhammad. He was born in 658 CE and is known as the fourth Imam in Shia Islam. His life was marked by the tragic events of the Battle of Karbala, where his father was martyred. After the battle, Ali Zayn al-Abidin became a prominent religious leader and scholar. He is best known for his work, Sahifah Sajjadiyyah, a collection of supplications and prayers that emphasize spirituality and ethics. His teachings continue to influence many Muslims today.