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Ali al-Sajjad, known as Zayn al-Abidin, died in 712. He was the fourth Shia Imam and the son of Husayn ibn Ali, who was martyred at the Battle of Karbala. Ali al-Sajjad was known for his piety and scholarship, and he is credited with compiling the Sahifa al-Sajjadiyya, a collection of prayers and supplications that is considered one of the most important works of Shia literature.