Al-Alaqat al-Siyasiyya bayna al-Dawla al-Abbasiyya wa Dawlat al-Firanja (Political Relations between the Abbasid State and the Frankish State)
A study of political relations between the Abbasid state and the Frankish (Carolingian) state under Harun al-Rashid and Charlemagne and after, including embassies, gifts and shared interests against the Umayyads of al-Andalus and the Byzantines.
Sulayman al-Ruhayli