Abbasid Caliphs of Bagdad, 772 AD. / 154 AH, Abdallah al-Mansur, Madinat Al-Salaam mint, AR dirham.

Abbasid Caliphs of Bagdad, first period, Abdallah al-Mansur (136 - 158 AH / 754 - 775 AD),
Madinat Al-Salaam mint (Baghdad), 154 AH, 772 AD.,
AR dirham (24-25 mm / 2,77 g),
Obv.: - Central Legend: الوسط ( there is no diety except) / الله وحده ( (the one) god alone) / لا شرك ل (he has no equal ) ,
- Marginal Legend: بسم الله ضرب هذا الدرهم بمدينة السلام سنة اربع و خمسين و مئ (In The Name of God. This dirham was struck in Madinat al-Salam in the year four and fifty and one hundred (154)).
Rev.: - Central Legend: محمد (Muhammad) / رسول (the Messanger) / الله (of God) / بخ بخ (Bakh Bakh) ,
- Marginal Legend: محمد رسول الله ارسله بالهدى و دين الحق ليظهره على الدين كله ولو كره المشركون ( Muhammad is the messenger of God. He sent him with guidance and the true religion to reveal it to all religions even if the polytheists abhor it.) .
Laviox 666 .

Abassid caliphs
The Umayyads lost the power through their bad government. A revolt in the east drove them out of Damascus and Baghdad of current notoriety became the urban light of the Muslim world. Abu Ja'far Abdallah ibn Muhammad al-Mansur was the second Abbasid Caliph. He reigned from 754 until 775. In 762 he founded as new imperial residence and palace city Madinat as-Salam, which became the core of the Imperial capital Baghdad. Baghdad was founded by the Abbasid caliph al-Mansur in 762. Perhaps the most well known of the Abbasid caliphs was Harun Al-Rashid: notably just, figured in the "Arabian Nights," presented an elephant to Charlemagne.