Siege of Mosul 1261-1262 in Jami’ al-tawarikh, by Rashid al Din Hamadani painted 1430 (as illustration only)
 

 

Abu Zakariyya al Azdi: Tarikh al Mawsil (History of Mosul) (d945)

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Taken from: Manufacturing and labour by Michael G. Morony

 

…… there were 4,000 Zanj slaves headed by a qa'id (a commander) in the army of the provincial governor of Mawsil (Mosul)

during the Caliphate of Abu Ja'far al-Mansur (754-775 A.D.). (1)

 

(1) this will be repeated by Al Maqrizi (1441)