Al-Rida lived with his father Musa al-Kazim in Medina until AH 179 (795/796). When Harun arrested Musa and transferred him to Iraq, he took care of Musa's property and the affairs of the Shias as the attorney of his father. With the death of Musa al-Kazim in Baghdad prison in Rajab AH 183 (799/800), his son Ali al-Rida became his heir and successor, according to his father's will.
According to Madelung, al-Kazim had appointed al-Rida as his executor and al-Rida also inherited his father's property near Medina, excluding his brothers. According to Musa al-Kazim will, the custody of his children, wives and property was also entrusted to Ali al-Rida. Ali spent the next ten years of his life - from AH 183 (799/800) to AH 193 (808/809) - in the reign of Harun.
Al-Mamun claimed for himself the title of Imam al-Huda (lit. 'rightly-guided leader'), possibly to imply that he was best qualified for the caliphate. Notably, he faced costly revolts in Kufa and Arabia by Alids and Zaydis, who intensified their campaign against the Abbasids around 815 CE, seizing the cities of Mecca, Medina, Wasit, and Basra. In particular, the Shia revolt by Abu'l-Saraya in 815 was difficult to suppress in Iraq, and compelled al-Hasan ibn Sahl, al-Mamun's governor of Iraq, to deploy the troops of the Khorasani general Harthama.
Throughout the years, several of al-Rida's brothers and his uncle Moḥammad ibn Ja'far participated in the Alid revolts in Iraq and Arabia, but al-Rida refused any involvement. In this period, al-Rida's only involvement in politics might have been to mediate between the Abbasid government and his uncle Muḥammad ibn Ja'far, who had revolted in Mecca.
Departing from the established anti-Shia policies of his predecessors, al-Mamun invited al-Rida to Khorasan in 816 CE, and designated him as successor in 817. According to Madelung, al-Mamun wrote to al-Rida in AH 200 (815/816), invited him to come to Merv, and also sent Raja ibn Abi'l Zahhak, cousin of his vizier, and a eunuch to accompany al-Rida on this trip. In the same year, al-Rida might have also made the pilgrimage to Mecca with his five-year-old son Muhammad al-Jawad. After some initial resistance, al-Rida set out for Merv in 816. According to a narration that some ancient sources have confirmed, Ma'mun had ordered that the Imam not be taken via Kufa and Qom, as he was worried that the feelings of the Shias of these cities in their friendship with the Imam would create problems for him (Ma'mun).
Though he did not pass through Qum on his way to Merv, he stayed for some time in Nishapur, where prominent Sunni traditionists visited him, including Ibn Rahuya, Yahya ibn Yahya, Moḥammad ibn Rafe', and Ahmad ibn Ḥarb. Al-Rida continued on to Marv after receiving a new summons from al-Mamun.
A number of Sunni hadith scholars also asked al-Rida to narrate a hadith for them that has become known as the Hadith of Golden Chain.
In Merv, al-Mamun first offered al-Rida the caliphate, though this was turned down by the latter. According to Madelung, al-Rida resisted al-Mamun's proposals for about two months until he reluctantly consented to an appointment as heir to the caliphate. The sources seem to agree that al-Rida was reluctant to accept this nomination, ceding only to the insistence of the caliph, with the condition that he would not interfere in governmental affairs or the appointment or dismissal of government agents. On 2 Ramadan 201 AH (23 March 817) by one account, the dignitaries and army leaders in Merv pledged their allegiance to the new heir apparent, who was dressed in green. An official announcement was made in the mosques throughout the empire, coins were minted to commemorate the occasion, and al-Mamun also changed the color of uniforms, official dress, and flags from black, the official Abbasid color, to green. This move possibly signified the reconciliation between the Abbasids and the Alids. To strengthen their relations, al-Mamun also married his daughter to al-Rida and promised another daughter to al-Rida's son in Medina, a minor at the time.
The motivations of al-Mamun for this appointment are not fully understood. At the time, he justified his decision by maintaining that al-Rida was the most suitable person for the caliphate. The reluctance of al-Rida in accepting this designation, however, might reflect his suspicion that al-Mamun had ulterior motives. With an age gap of more than twenty years, it also seems unlikely that al-Rida would ever have succeeded the much younger al-Mamun. With this appointment, some have suggested that al-Mamun hoped for the support of the Shia and respite from their numerous revolts. Others have suggested that al-Mamun was influenced by his powerful Persian vizier, af-Fadl ibn Sahl, who had Shia tendencies. Madelung, however, finds it more likely that the initiative to appoint al-Rida belonged to al-Mamun and not his vizier. Some authors have not found the appointment surprising, noting the strained or severed relations of the caliph with his Abbasid relatives. Yet others have written that al-Mamun wanted a merit-based caliphate, though he made no mention of rules governing the succession to al-Rida during the ceremony. It has been suggested that al-Mamun might have wanted to heal the Sunni-Shia division, while Lapidus and others hold that al-Mamun wanted to expand his authority by adopting the Shia views about the divine authority of religious leaders, alongside his later religious inquisition (mihna). Bayhom-Daou considers it likely that al-Mamun saw this appointment as a means of discrediting the Shia doctrine of Imamate, and Tabatabai writes that al-Mamun might have also hoped to undermine the position of al-Rida as a Shia religious leader by engaging him in politics.
Al-Rida's rejection of al-Mamun's initial offer for replacing him as the caliph has been used to argue that al-Rida's ultimate aim was not temporal and political power. Rather, Mavani suggests that such power was merely a means for the Imam to reach the ultimate goal of guiding the community to salvation. When al-Rida was asked why he accepted the successorship, he is reported to have emphasized his unwillingness, responding, "The same thing which forced my grandfather the Commander of the Faithful [Ali ibn Abi Talib] to join the arbitration council [i.e., coercion]". To show his dissatisfaction with the trip to Khorasan, as reported by Ibn Babuyyah, al-Rida not only refused to take his family with him but also asked them to cry loudly for him, saying that he would never return to his family's embrace.
It also appears that this appointment did not alienate any of the followers of al-Rida which, according to Bayhom-Daou, might imply that they were convinced that he was a reluctant player who had no choice but to accept his designation as the heir apparent.
Perhaps incorrectly, the appointment of al-Rida was at the time largely attributed to the influence of al-Mamun's Persian vizier, al-Fadl ibn Sahl. Nevertheless, various Abbasid governors, with the exception of Ismail ibn Jafar in Basra, loyally carried out their orders and exacted the oath of allegiance to the new heir. The appointment of the Alid al-Rida by the Abbasid al-Mamun apparently brought him the support of several notable Alids and nearly all the Zaydite partisans. It also immediately invoked strong opposition, particularly among the Abbasids and Arab Sunni nationalists. Al-Mamun's decision did not carry the public opinion of the Iraqis, who declared him deposed and installed Ibrahim ibn al-Mahdi, another Abbasid, as caliph in 817, while the popular militia roamed through Baghdad, demanding a return to the Quran and the Sunna. Ibrahim, a half-brother of al-Mamun's father, is said to have been a weak statesman and a mere figurehead, whose rule was largely confined to Baghdad. There were also military engagements in Baghdad, Kufa, and Wasit between al-Mamun's forces and the supporters of Ibrahim who were themselves much harassed by financial and logistical difficulties.
Al-Rida was given a high status at the court of al-Mamun. While the caliph evidently desired that al-Rida should immediately engage in all official ceremonies, the latter is reported to have refrained, stipulating that he would not participate in government affairs. Al-Rida was given his own police force and guard, as well as a chamberlain and a secretary. The caliph is said to have relied on the judgment of al-Rida in religious questions and arranged for debates between him and scholars of Islam and other faiths. According to Rizvi, however, these religious disputations seem to have been designed as set pieces to embarrass al-Rida. Their accounts were later recorded by Ibn Babawayh in his Uyun akhbar al-Rida.
The seriousness of the civil unrest in Iraq was apparently kept hidden from al-Mamun by his vizier until 818, and it was al-Rida who urged the caliph to return to Baghdad and restore peace. Al-Rida's assessment was supported by several army chiefs and al-Mamun thus left Khorasan in 818. Before their return, his vizier offered his resignation, pointing out the hatred of the Abbasids in Baghdad for him personally, and requested the caliph to leave him as governor in Khorasan. Al-Mamun instead assured the vizier of his unrestricted support and published a letter to this effect throughout the empire. However, six months later in Sha'ban 202 (February 818), the vizier was assassinated in Sarakhs by several army officers as he accompanied al-Mamun back to Baghdad. Those responsible were soon executed, but not before declaring that they had been acting on the orders of the caliph. Henceforth, al-Mamun governed with the help of counsellors on whom he did not confer the title of vizier.
The caliph then asked a group of Alids to examine the body of al-Rida and testify that he had died of natural causes. At the funeral, al-Mamun recited the last prayers himself. The reports note his display of grief during the funeral. Madelung does not view these emotions as necessarily insincere, noting that on other occasions in the reign of al-Mamun, cold political calculation appears to have outweighed the personal sentiments and ideals. A year later, in Safar 204 (August 819), the caliph entered Baghdad without a fight. The anti-caliph, Ibrahim ibn al-Mahdi, had already fled from the city several weeks earlier. The return to Baghdad marked the end of the pro-Shia policies of al-Mamun, and was followed by the return to the traditional black color of the Abbasids.
Al-Mamun buried al-Rida in Tus next to his father, Harun al-Rashid. Tus was later replaced with a new city, called Mashhad (lit. 'place of martyrdom'), developed around the grave of al-Rida as the holiest site in Iran for the Shia. The present shrine dates to the fourteenth century, when the Il-khan Öljaitü converted to Twelver Shi'ism. Most of the elaborate decorative work in the present imposing complex dates from Safavid and Qajar periods. Adjacent to the shrine is the Goharshad Mosque, one of the finest in Iran, named after the wife of the Timurid emperor Shah Rukh and completed in 1394. Several theological colleges have been built around the shrine, the most famous of which is that of Mirza Ja'far Khan.
The traditional ritual of Khutbeh Khani (lit. 'reciting sermon') is held annually on the night of al-Rida's death. The ritual, dating back to governor Ali Shah of Khorasan in 1160 AH, involves the servants of the holy site walking from the nearest street to Inqilab yard with candles in their hands. There, they stand around the yard and the crowd recites religious sermons and praise God. This ritual is also repeated on the night of Ashura.
During his Imamate, al-Rida fought fiercely against the leaders of the Waqifiyya, calling them enemies of the truth, wanderers, heretics, infidels, and polytheists. In one case, he compared the Waqifiyya with the Jews and stated that verse 64 of Surah Al-Ma'idah was revealed about the Waqifiyya because they, like the Jews, doubted the continuity of the Imamate because no child had yet been born to the Imam and attributed impotence to God. The term Waqifiyya is applied generally to any group who denies or hesitates over the death of a particular Shia Imam and refuses to recognize his successors.
According to Kohlberg, the creation of Waqifiyya might have had a financial reason. Some of the representatives of al-Kazim evidently refused to hand over to al-Rida the monies entrusted to them, arguing that al-Kazim was the last Imam. These included Mansur ibn Yunus Buzurg and Ali ibn Abi Ḥamza al-Bataini, Ziyad ibn Marwan al-Kandi, Uthman ibn Isa al-Amiri al-Ruasi (Ruwasi). Some reports indicate that al-Ruasi repented.
Muhammad, the only child of al-Rida, was seven years old when his father died. The succession of the young Muhammad, who later became known as al-Jawad (lit. 'the generous'), became controversial among the followers of his father. A group of them instead accepted the imamate of al-Rida's brother, Ahmad ibn Musa. Another group joined the Waqifiyya, who considered al-Kazim to be the last Imam and expected his return as Mahdi. Some had opportunistically backed the imamate of al-Rida after his appointment as successor to the caliphate and now returned to their Sunni or Zaydi communities. Tabatabai, however, regards the divisions in Shia after al-Rida as insignificant and often temporary. Twelver scholars have noted that Jesus received his prophetic mission in the Quran when he was still a child, and some hold that al-Jawad had received the requisite perfect knowledge of all religious matters through divine inspiration from the time of his succession, irrespective of his age.
As related by Ibn Babuwayh, at the beginning of al-Rida's presence in Khorasan, it did not rain much. Al-Mamun asked al-Rida to pray for rain. He accepted and appointed Monday for this work. In the morning al-Rida went to the desert with the people and went to the pulpit and asked God for rain. After that, clouds appeared in the sky and when people returned to their homes, it started raining heavily. A large crowd gathered around al-Rida and people congratulated him on this honor.
Donaldson includes the account of Reyyan ibn Salt who, when bidding farewell to his Imam, was so overcome with grief that he forgot to ask al-Rida for one of his shirts, to use as a shroud, and some coins, to make rings for his daughters. As Reyyan was leaving, however, al-Rida called to him, "Do you not want one of my shirts to keep as your shroud? And would you not like some pieces of money for rings for your daughters?" Reyyan left after al-Rida fulfilled his wishes.
The title al-Rida (lit. 'the approved one') was reputedly bestowed upon him by the caliph, in a reference to a descendant of Muhammad upon whom Muslims would agree for the caliphate (al-rida min al Muhammad), a rallying cry of the Shia and, earlier, of Abbasids against the Umayyads.
Muhammad al-Jawad, according to Ibn Babawiyah, stated that God called him Rida because his enemies and his friends were pleased with him, while this did not happen to any of his fathers. Al-Rida is also known as Abu al-Hasan al-Thani (lit. 'Abu al-Hasan, the second') to distinguish him from his father, Musa al-Kazim, who is also known as Abu al-Hasan al-Awwal (lit. 'Abu al-Hasan, the first').
In a move to strengthen their ties, al-Mamun had married his daughter, Umm Habib, to al-Rida, though no children resulted from that marriage. Muhammad, who later became known as Muhammad al-Jawad, was the child of al-Rida, born to Sabika (or Khayzuran), a freed slave (umm walad) from Nubia, who was said to have descended from the family of Maria al-Qibtiyya, a freed slave of the prophet and mother of his son Ebrahim, who died in childhood. There is a disagreement as to the number of children Ali al-Rida had. Some have reported them as five sons and one daughter with the names of Muhammad, Hasan, Ja'far, Ibrahim, Husayn and A'isha. According to Ibn Hazm al-Rida had three sons named Ali, Muhammad, and Hussein, whose lineage continued through Muhammad. While others mentioned the existence of a daughter of Ali al-Rida called Fatima.
In addition to Shia authorities, Sunni biographical sources also list al-Rida as one of the narrators of prophetic hadiths, and al-Waqidi considers him a reliable transmitter. As a Shia Imam who rejected the authority of Muhammad's companions as hadith transmitters, initially only the Shia transmitted hadith on the authority of al-Rida. In his later years, however, notable Sunni traditionists were said to have visited him, including Ishaq ibn Rahwayh and Yahya ibn Yahya. In particular, his appointment as the heir apparent seemed to have added to the credibility to al-Rida in Sunni circles, who at the time apparently came to regard him as a distinguished transmitter by virtue of his learning and descent from the prophet. In view of his continued veneration as a Shia Imam, later Sunni authors were divided about the authority of al-Rida, some saying that he was not always a reliable transmitter and others instead questioning the authority of those who transmitted from al-Rida. They all seem to refer to him as a man of piety and learning.
Al-Rida is represented in historical sources as a thoughtful and likable man. He was of medium height, according to Ibn Sabbagh, and his skin color was dark or wheatish. He ate slowly and little and used to wear cheap and rough clothes, but when he met people, he wore luxurious clothes.
When he laughed, he did not giggle and smiled. He used to sit and eat with his slaves. He did not make his guests to work for him and tried to respect them in the best possible way. Byzanti relates that when he visited al-Rida for a few hours, al-Rida invited him to stay for the night and spread his own bed for Byzanti. Muhammad ibn Ghaffar narrates that when he visited al-Rida to ask for financial help, al-Rida fulfilled his wish before he mentioned his need and then invited Muhammad to stay overnight as his guest. When he was in Khorasan, he distributed all his wealth among the people on the Day of Arafat.
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