9th-century Abbasid caliphs

5th Abbasid caliph (r. 786–809)

Abū al-ʿAbbās Abd Allāh ibn Hārūn al-Maʾmūn (; 14 September 786 – 9 August 833), 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 power and prosperity of the Abbasid Caliphate, al-Ma'mun promoted the Graeco-Arabic translation movement, the flowering of learning and the sciences in Baghdad, and the publishing of al-Khwarizmi's book now known as "Algebra", making him one of the most important caliphs in the Islamic Golden Age. He is also known as a proponent of the rational Islamic th

Abū Isḥāq Muḥammad ibn Hārūn al-Rashīd (; October 796 – 5 January 842), better known by his regnal name al-Muʿtaṣim biʾllāh (, ), was the eighth Abbasid caliph, ruling from 833 until his death in 842. When al-Ma'mun died unexpectedly on campaign in August 833, al-Mu'tasim was thus well placed to succeed him, with the support of the powerful chief , Ahmad ibn Abi Duwad, he continued to implement the rationalist Islamic doctrine of Mu'tazilism and implementing policy.

Abū Mūsā Muḥammad bin Hārūn al-Amīn (; April 787 – 24/25 September 813), better known by just his laqab of al-Amīn (), was the sixth Abbasid caliph from 809 to 813.

Abu’l-ʿAbbās Aḥmad ibn Jaʿfar ibn Muḥammad ibn Hārūn al-Muʿtamid ʿalā’Llāh (; – 14 October 892), better known by his regnal name '''al-Muʿtamid ʿalā 'llāh''' (, 'Dependent on God'), was the caliph of the Abbasid Caliphate from 870 to 892. His reign marks the end of the "Anarchy at Samarra" and the start of the Abbasid restoration, but he was largely a ruler in name only. Power was held by his brother al-Muwaffaq, who held the loyalty of the military. Al-Mu'tamid's authority was circumscribed further after a failed attempt to flee to the domains controlled by Ahmad ibn Tulun in late 882, and he

'''Abū Jaʿfar Hārūn ibn Muḥammad al-Wathiq bi'Llah (; 18 April 81210 August 847), commonly known by his regnal name al-Wathiq bi'Llah''' (), was an Abbasid caliph who reigned from 842 until his death in 847.

Abū al-ʿAbbās Aḥmad ibn Ṭalḥa ibn Jaʿfar ibn Muḥammad ibn Hārūn (853/4 or 860/1 – 5 April 902), better known by his regnal name al-Muʿtaḍid bi-llāh (), was the caliph of the Abbasid Caliphate from 892 until his death in 902.

'''Abu Ja'far Muḥammad ibn Ja'far ibn Muḥammad ibn Hārūn al-Muntasir biʾLlāh (; November 837 – 7 June 862), better known by his regnal title al-Muntasir biʾLlāh''' (, "He who triumphs in God") was the caliph of the Abbasid Caliphate from 861 to 862, during the "Anarchy at Samarra". The power struggle between al-Muntasir and his brother, al-Mu'tazz, backed by different factions, climaxed with the Turkic leaders plotting the murder of his father al-Mutawakkil. Following the assassination in 861, al-Muntasir assumed the caliphate with Turkic support.

Abū Isḥāq Muḥammad ibn Hārūn ibn Muḥammad ibn Hārūn al-Muhtadī bi-ʾLlāh (‎; – 21 June 870), better known by his regnal name al-Muhtadī bi-ʾLlāh (Arabic: , "Guided by God"), was the Caliph of the Abbasid Caliphate from July 869 to June 870, during the "Anarchy at Samarra".

Abū ʿAbd Allāh Muḥammad ibn Jaʿfar ibn Muḥammad ibn Hārūn al-Muʿtazz bi-ʾLlāh (; 847 – 16 July 869), better known by his regnal title al-Muʿtazz bi-ʾLlāh (, "He who is strengthened by God") was the Abbasid caliph from 866 to 869, during a period of extreme internal instability within the Abbasid Caliphate, known as the "Anarchy at Samarra".

Abū al-ʿAbbās Aḥmad ibn Muḥammad al-Mustaʿīn bi-ʾllāh (; 836 – 17 October 866), better known by his regnal title al-Mustaʿīn, was the Abbasid caliph from 862 to 866, during the "Anarchy at Samarra". A grandson of Caliph al-Mu'tasim, he was installed on the throne by the Turkic military commanders following the death of al-Muntasir.

caliphs of the Abbasid Caliphate