Abū al-ʿAbbās Abd Allāh ibn Hārūn al-Maʾmūn, better known by his regnal name al-Ma'mun, was the seventh Abbasid caliph, who reigned from 813 until his death in 833. His leadership was marked by the po
Gold dinar of al-Ma'mun, minted in Egypt in 830/1
Silver Dirham of al-Ma'mun. AH 199–218 / AD 813–833. Dirham weight 25mm, 3.19 g, 3h. Medinat Isbahan mint dated AH 205 (820/1 AD)
The populace pays allegiance to the Abbasid caliph, al-Ma'mun in 813. (from the book Tarikh-i Alfi 1593 CE)
The Byzantine embassy of John the Grammarian in 829 to Ma'mun (depicted left) from Theophilos (depicted right)
Ali ibn Musa al-Rida was a descendant of the Islamic prophet Muhammad and the eighth of the Twelve Imams, succeeding his father Musa al-Kazim and his grandfather Ja'far al-Sadiq. His lineage traces th
Al-Ma'mun
…adopted Sahl's religious "formula" until they became alarmed at his power and combined to crush him in 817–18 CE. In A.H. 201 (817 AD) al-Ma'mun named Ali al-Rida (the sixth-generation descendant of Ali and the eighth Shia Imam) as his heir as caliph. This move may have been made to appease Shi'ite opinion in…
Silver Abbasid dirham, minted in Isfahan around 817, citing al-Ma'mun as caliph and al-Rida as heir apparent (wali ahd al-muslimin). It is preserved at the Astan Quds Razavi Central Museum.
30 million Muslims making pilgrimages to the Imam Reza Shrine annualy, the world's largest mosque after Masjid al-Haram in Mecca and the Prophet's Mosque in Medina.
Dar al-Hifaz, one of the shrine's closest sections to the tomb of al-Rida.
A copy of the Quran ascribed to al-Rida, preserved at the Astan Quds Razavi Central Museum.