Harun al-Rashid receiving a delegation of Charlemagne in Baghdad, by Julius KöckertAn Abbasid–Carolingian alliance was attempted and partially formed during the 8th to 9th century through a series of embassies, rapprochements and combined military operations between the Frankish Carolingian Empire and the Abbasid Caliphate or the pro-Abbasid Muslim rulers in Spain. These contacts followed the intense conflict between the Carolingians and the Umayyads, marked by the landslide Battle of Tours in 732, and were aimed at establishing a counter-alliance with the faraway Abbasid Empire. Slightly later, another Carolingian-Abbasid alliance was attempted in a conflict against the Byzantine Empire.

Harun al-Rashid receiving a delegation of Charlemagne in Baghdad, by Julius Köckert
An Abbasid–Carolingian alliance was attempted and partially formed during the 8th to 9th century through a series of embassies, rapprochements and combined military operations between the Frankish Carolingian Empire and the Abbasid Caliphate or the pro-Abbasid Muslim rulers in Spain. These contacts followed the intense conflict between the Carolingians and the Umayyads, marked by the landslide Battle of Tours in 732, and were aimed at establishing a counter-alliance with the faraway Abbasid Empire. Slightly later, another Carolingian-Abbasid alliance was attempted in a conflict against the Byzantine Empire.