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ʿAlī ibn al-Ḥusayn Zayn al-ʿĀbidīn, also known as al-Sajjād or simply as Zayn al-ʿĀbidīn, c. 4 January 659 – c. 13 October 713, was an Imam in Shiʻi Islam after his father Husayn ibn Ali, his uncle Hasan ibn Ali, and his grandfather, Ali ibn Abi Talib.