Overview
Ali ibn Musa al-Rida (, 1 January 766 – 6 June 818), also transliterated al-Reza, also known as Abū al-Ḥasan al-Thānī, was a descendant of the Islamic prophet Muhammad, and the eighth imam in Twelver Shia Islam, succeeding his father, Musa al-Kazim. He is also part of the chain of mystical authority in Sunni Sufi orders. He was known for his piety and learning, and a number of works are attributed to him, including Al-Risala al-Dhahabia, Sahifa al-Rida, and Fiqh al-Rida. Uyun al-Akhbar al-Rida by Ibn Babawayh is a comprehensive collection that includes his religious debates and sayings, biographical details, and even the miracles which have occurred at his tomb. He is buried in Mashad, Iran, site of a large shrine.
Al-Rida was contemporary with the Abbasid caliphs Harun al-Rashid and his sons, al-Amin and al-Ma'mun. In a sudden departure from the established anti-Shia policy of the Abbasids, possibly to mitigate the frequent Shia revolts, al-Mamun invited al-Rida to Marv in Khorasan, his de facto capital, and designated him as heir apparent, despite the reluctance of the al-Rida who accepted the offer on the condition that he would not interfere in governmental affairs. The appointment of the Ali al-Rida by the Abbasid al-Mamun immediately invoked strong opposition, particularly among the Abbasids and Arab Sunni nationalists, who revolted and installed Ibrahim al-Mubarak, a half-brother of Harun al-Rashid, as the anti-caliph in Baghdad. Realizing the severity of the Iraqi opposition, al-Mamun and his entourage left Khorasan for Baghdad, accompanied by al-Rida. The Imam, however, died mysteriously when the party reached Tus in September 818. His death followed shortly after the assassination of al-Fadl ibn Sahl, the Persian of al-Mamun, who was publicly seen as responsible for his pro-Shia policies. The caliph is often seen as responsible for both deaths, as he made concessions to the Arab party to smooth his return to Baghdad. Tus was later replaced with a new city, called Mashhad, which developed around the grave of al-Rida as the holiest site in Iran, to which millions of Shia Muslims flock annually for pilgrimage.
Birth and early life
Ali was born in Medina in 765 (148 AH), 768 (151 AH), or 770 (153 AH). The first date is said to be based on a prediction ascribed to his grandfather, al-Sadiq, who died in that year, that the successor to his son al-Kazim would be born soon. There are some indications that Ali might have been born as late 159 AH.
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