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The 7th self-styled caliph of the usurper Abbasid regime, Abdullah al-Mamoun

Compiled By: Syed Ali Shahbaz
On 17th of the Islamic month of Rajab in 218 AH, the 7th self-styled caliph of the usurper Abbasid regime, Abdullah al-Mamoun, died near Tarsus in what is now southwestern Turkey, during a campaign against the Byzantine Empire, at the age of 48 years, after a 24-year reign, four of which were involved in civil war with his step brother, Amin, the rival caliph in Baghdad whom he eventually ordered killed.
Born to the tyrant Haroun's Iranian concubine Marajel, his capital was initially the Khorasani city of Merv, which is currently in the Republic of Turkmenistan. He earned lasting damnation for forcing Imam Reza (AS), the 8th Infallible Successor of Prophet Mohammad (SAWA), to come to Merv from distant Medina, as part of his plot to isolate the Ahl al-Bayt from the ummah.
When the Imam's popularity tremendously grew among the people during his two-year sojourn in Khorasan, the crafty Mamoun martyred the Prophet's rightful heir in Tous through a fatal dose of poison.

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