al-Mahdi Caliph of the Abbasid Caliphate from 6. Oct 775 to 24 July 785.
Abu Abdallah Muhammad ibn Abdallah al-Mansur (Arabic: أبو عبد الله محمد بن عبد الله المنصور‎‎), better known by his regnal name al-Mahdi (المهدي, "He who is guided by God"), was the third Abbasid Caliph who reigned from 775 to his death in 785. He succeeded his father, al-Mansur.

Al-Mahdi reigned for ten years. He imprisoned his most trusted vizier Ya'qub ibn Dawud, and in the year 167 AH/ 783 AD, al-Mahdi instituted an official inquisition which led to the execution of alleged Zindiq (heretics).
al-Mahdi
Epithet: al-Mahdi ("He who is guided by God")
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An AR Dirham struck 780 AD in Madinat-al-Salam
Obverse: Margin: بسم الله ضرب هذا الدرهم بمدينة جى سنة اثنين و ستين و مئة Center: لا الاه الا الله وحده لا شريك له

Reverse: Margin: محمد رسول الله ارسله بالهدى و دين الحق ليظهره على الدين كله ولو كره المشركون Center: محمد رسول الله صلى الله عليه و سلم الخليفة المهدى يحيى

Diameter: 23 mm
Die Orientation: 2 H
Weight: 3 g
No notes for this coin
A.215.1