Ali ibn Husayn Zayn al-Abidin (), also known as al-Sajjad (, "The Consistently Prostrating") or simply Zayn al-Abidin (, "Adornment of the Worshippers"), (c. 4 January 659c. 20 October 713) was the fourth Imam in Shiʻi Islam after his father Husayn ibn Ali, his uncle Hasan ibn Ali, and his grandfather, Ali. He is considered a respected scholar among Sunnis and hadiths reported by him are recorded in all six major Sunni hadith collections. He was born, according to some sources, from Shahrbanu.