29 Safar: The Martyrdom of Imam Reza

Imam Reza spent most of his life in Medina, but in 817 CE, at around fifty-two years old, Caliph al-Ma’mun — freshly victorious from a civil war against his brother al-Amin — summoned him to his court in Merv (in present-day Turkmenistan) and named him heir apparent, an unprecedented move: the only time one of the Twelve Imams was formally made heir to a caliph. According to tradition, Imam Reza accepted the position only reluctantly and on condition that he would not interfere in the government’s executive affairs. During his time in Ma’mun’s territory, he took part in several scholarly debates with Christian, Jewish, Zoroastrian, and Sabian scholars, displaying deep knowledge of theology and comparative religion. He died in 818 CE, at around fifty-three years old, in Tus (Sanabad, near present-day Mashhad, Iran).

According to historical accounts, Imam Reza fell ill after eating grapes and then drinking grape or pomegranate juice given to him by order of al-Ma’mun, and died only two days later. Shia sources treat this as deliberate poisoning ordered by al-Ma’mun — similar to poisonings attributed to several other Imams — occurring precisely as the political climate around his position as heir apparent had grown tense, particularly among the Abbasid family in Baghdad, who saw the appointment as a threat to their own position. Like most poisoning accounts involving the Imams, Sunni sources and academic research treat this attribution with more caution, though his death at a relatively young age, in the midst of that same political crisis, is accepted across both traditions.

Al-Ma’mun’s true motive — both for naming Imam Reza heir apparent and, Shia Muslims believe, for having him poisoned — is debated among historians. Some argue Ma’mun genuinely admired Imam Reza’s learning and mysticism and that the appointment was sincere; many others see it as a calculated political move to quiet Shia and Alid discontent after the civil war with al-Amin — a move that, Shia tradition holds, later led to the same poisoning once Imam Reza’s growing popularity among the public and even government officials began to worry Ma’mun about losing real power within the Abbasid family.

The exact date of Imam Reza’s martyrdom is disputed in historical sources. Iran’s official, popularly observed calendar today marks it as 29 Safar — the date this article is based on. But in older classical sources, the most common and best-known account places it on 30 Safar, 203 AH (corresponding to 818 CE); some other sources cite the 17th of Safar, and Sheikh Mufid, in his book Masar al-Shi’a, gives an entirely different date — the 23rd of Dhul-Qa’dah of the same year. Even the year itself is not settled: researchers have considered 202, 203, and 206 AH all plausible. These discrepancies are a normal feature of early Islamic historiography, not a sign that the event itself is in doubt.

Unlike the solar Gregorian calendar, the Islamic lunar calendar follows the moon, and its year runs about 11 days shorter. As a result, the Gregorian equivalent of 29 Safar falls roughly 11 days earlier each year than the year before. This year (1448 AH), it falls on Thursday, August 13, 2026 — exactly one day after 28 Safar, the anniversary of Prophet Muhammad’s passing and Imam Hasan al-Mujtaba’s martyrdom. In Iran, this day is an official public holiday. Like the rest of Noorjoo’s calendar content, only this section is updated annually; the moon-sighting used to fix the exact date may shift it by a day or two depending on the religious authority followed.

For many Shia Muslims, 29 Safar is a day of mourning, black clothing, and memorial gatherings recounting the life and virtues of Imam Reza. The main focus of this observance is Imam Reza’s shrine in Mashhad, where millions of pilgrims from across Iran and the world gather each year, especially on this day. A similar, smaller-scale observance takes place at the shrine of his sister, Fatima Masumeh, in Qom.