At a glance
- Era
- The Early Abbasid Caliphate
- Identifiers
- Wikidata
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Muhammad ibn Abd Allah al-Mahdi was the third Abbasid caliph and al-Mansur's son. He finished the border cities his father began and ordered al-Hadath built, began building the Sacred Mosque and the Prophet ﷺ's Mosque, and rebuilt Jerusalem after the earthquakes — al-Mas'udi calls him gentle and generous.
Muhammad ibn Abd Allah al-Mansur al-Mahdi, third Abbasid caliph and al-Mansur's son. Al-Baladhuri records him sending his son Harun on the raid into Roman lands in 163 AH that besieged Samalu — the fate of its people being disputed — and he finished the remaining border cities and forts his father began, strengthening their garrisons and ordering al-Hadath built; he had the pledge taken for Musa al-Hadi then Harun al-Rashid. Al-Mas'udi calls him gentle and generous, records his severity against those he named the heretics as the books of Mani, Ibn Daysan and Marcion spread — and that he was the first to order the dialectical theologians to compose books answering them; and he began building the Sacred Mosque and the Prophet ﷺ's Mosque, and rebuilt Jerusalem after the earthquakes. He died at the village of Radin in 169 AH, his caliphate lasting ten years, a month and fifteen days.
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Muhammad ibn Abd Allah al-Mansur al-Mahdi, third Abbasid caliph and al-Mansur's son. Al-Baladhuri records him sending his son Harun on the 163 AH raid into Roman lands that besieged Samalu — the fate of its people disputed under the Samalu captives — and that he finished the remaining border cities and forts his father began, strengthened their garrisons and ordered al-Hadath built; al-Suyuti records his taking the pledge of succession for Musa al-Hadi then for Harun al-Rashid. Al-Mas'udi calls him gentle and generous, records his severity against those he named the heretics as the books of Mani, Ibn Daysan and Marcion spread, and that he was the first to order the dialectical theologians to compose books in refutation; and that he began building the Sacred Mosque and the Prophet ﷺ's Mosque and rebuilt Jerusalem after the earthquakes. His death is told at the village of Radin in 169 AH, his caliphate lasting ten years, a month and fifteen days.
Overview
In his reign
Al-Baladhuri relates that he sent his son Harun on a raid into the lands of the Byzantines in 163 AH, and he besieged Samalu. He mentions a disagreement over the fate of its people, the captives of Samalu. 1
He completed the building of the frontier cities and fortresses that remained after his father, and increased their garrisons. He ordered the building of al-Hadath. 1
Al-Suyuti says that he gave the oath of allegiance for the heirship first to Musa al-Hadi and then to Harun al-Rashid. 2
His character and works in al-Mas'udi
Al-Mas'udi describes him as generous and open-handed. He says that he went to great lengths in killing those he called heretics, because the books of Mani, Ibn Daysan and Marcion had spread. He was the first to order the dialectical theologians to write books refuting them. 3
He says that he began the building of the Sacred Mosque and the Mosque of the Prophet ﷺ, and built Jerusalem after the earthquakes had destroyed it. 3
He relates that he died in 169 AH at the village of Rudhin, and that his caliphate lasted ten years, one month and fifteen days. 4
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Connections
- Child of
- Abu Ja'far al-Mansur
- Participated in
- The Aman of Samalu and its People's Transfer to Baghdad· The Digging of Nahr al-Sila· The Taking and Settling of Mar'ash· Death of al-Mahdi· Deposition of Isa ibn Musa from the succession· The execution of Salih ibn Abd al-Quddus· The Building of Madinat al-Hadath· The Founding of Madinat al-Salam (Baghdad)· Founding of al-Muhammadiyya at Rayy· The Building of al-Rafiqa· The Building of Sisar· The Building of Tarsus· Ghiyath's Fabricated Hadith and 'Your Nape Is a Liar's Nape'· Establishment of the barid from the Hijaz to Iraq· Works on the Mecca road and reform of the minbars· The Great Enlargement of the Sacred Mosque· Pursuit of the zanadiqa under al-Mahdi· Michael's Incursion on the Mar'ash Depths, 161
- Parent of
- Harun al-Rashid
People and things also explored
Harun al-Rashid· Abu Ja'far al-Mansur· Baghdad· The Building of al-Rafiqa· Ali ibn Sulayman ibn Ali· al-Hasan ibn Qahtaba· Mar'ash (Germanikeia)· The Aman of Samalu and its People's Transfer to Baghdad
Sources
- Futuh al-Buldan — al-Baladhuri (Mu'assasat al-Ma'arif edition)
- Tarikh al-Khulafa — al-Suyuti (Dar al-Minhaj edition) , p. 440-442
- Muruj al-Dhahab — al-Masʼudi , p. 669
- Muruj al-Dhahab — al-Masʼudi , p. 298-303
Cite this page
islam.museum contributors. “Muhammad al-Mahdi”. islam.museum, https://islam.museum/en/person/al-mahdi/. CC BY-SA 4.0. Last updated 2026-10-26.