Uyoun Akhbar Al-Ridha in the context of "Ali al-Ridha"

The Imam Reza Shrine (Persian: حرم امام رضا, romanized: Haram-e Emâm Rezâ, lit. 'Sanctuary of Imam Reza'; Arabic: العتبة الرضوية) is the mausoleum of Ali al-Rida, the eighth Imam in Shia Islam, located in Mashhad, the province of Razavi Khorasan, Iran. As one of the holiest sites in Shia Islam, nearly 30 million Muslims making pilgrimages to the shrine every year, the most visited pilgrimage site in Islam.

Imam Reza was a great-grandson of Islamic prophet Muhammad, known for his piety and learning. He is part of the chain of mystical authority in Sunni Sufism, making him widely respected in Sunni Islam as well. He is also regarded as a model of asceticism in Sufism, and the chains of authority in Shia Sufism progress through him. Uyoun Akhbar Al-Ridha have recorded miracles which have occurred at the shrine.

Ali ibn Musa al-Rida (Arabic: عَلِيّ ٱبْن مُوسَىٰ ٱلرِّضَا, romanized: ʿAlī ibn Mūsā al-Riḍā, c. 1 January 766 – c. 6 June 818), 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 in 799 CE. 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-Risalah al-Dhahabiah, Sahifah of al-Ridha, and Fiqh al-Rida. Uyoun Akhbar Al-Ridha 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 (r. 786–809) and his sons, al-Amin (r. 809–813) and al-Ma'mun (r. 813–833). 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 Merv 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 Ali al-Rida by the Abbasid al-Mamun immediately invoked strong opposition, particularly among the Abbasids, who revolted and installed Ibrahim ibn al-Mahdi, a half-brother of Harun al-Rashid, as the anti-caliph in Baghdad. Realising 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 vizier 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.

Ali ibn Musa al-Rida (Arabic: علي بن موسى الرضا, romanized: ʿAlī ibn Mūsā al-Riḍā, c. 1 January 766 – c. 6 June 818), 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 in 799 CE. 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-Risalah al-Dhahabiah, Sahifah of al-Ridha, and Fiqh al-Rida. Uyoun Akhbar Al-Ridha 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 (r. 786–809) and his sons, al-Amin (r. 809–813) and al-Ma'mun (r. 813–833). 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 Merv 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 Ali al-Rida by the Abbasid al-Mamun immediately invoked strong opposition, particularly among the Abbasids, who revolted and installed Ibrahim ibn al-Mahdi, a half-brother of Harun al-Rashid, as the anti-caliph in Baghdad. Realising 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 vizier 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.