The Zanj slave rebellion

The Zanj Rebellion, a slave revolt in the Abbasid Caliphate in present day Iraq from 869 through 883. 

The Zanj Rebellion (Arabic: ثورة الزنج Thawrat al-Zanj / Zinj) was a major revolt against the Abbasid Caliphate, which took place from 869 until 883. Begun near the city of Basra in present-day southern Iraq and led by one Ali ibn Muhammad, the insurrection involved enslaved Bantu-speaking people (Zanj) who had originally been captured from the coast of Southeast Africa and transported to the Middle East, principally to drain the region's salt marshes. It grew to involve slaves and freemen, including both Southeastern Africans and Arabs, from several regions of the Caliphate, and claimed tens of thousands of lives before it was finally defeated.

Several Muslim historians, such as al-Tabari and al-Mas'udi, consider the Zanj revolt to be one of the "most vicious and brutal uprisings" of the many disturbances that plagued the Abbasid central government. Modern scholars have characterized the conflict as being "one of the bloodiest and most destructive rebellions which the history of Western Asia records," while at the same time praising its coverage as being among the "most fully and extensively described campaign[s] in the whole of early Islamic historical writing." The precise composition of the rebels remains a subject of debate, both as regards their identity and as to the proportion of slaves and free among them – available historical sources being open to various interpretations.

The Zanj were Bantu-speaking people who had been forcibly taken from Southeast Africa and were enslaved primarily for agricultural labor as part of the plantation economy of southern Iraq. The demand for servile labor during this period was fueled by wealthy residents of the port city of Basra, who had acquired extensive marshlands in the surrounding region. These lands had been abandoned as a result of peasant migration and repeated flooding over time, but they could be converted back into cultivatable status through intensive labor.

Local magnates were able to gain ownership of this land on the condition that they would make it arable. As a result, they acquired large numbers of Zanj and other slaves, who were placed into work camps and tasked with clearing away the nitrous topsoil as part of the reclamation process. Other Zanj were used to work in the salt flats of lower Iraq, especially in the area around Basra.

Both the working and living conditions of the Zanj were considered to be extremely miserable. The menial labor they were engaged in was difficult and the slaves appear to have been poorly treated by their masters. Two previous attempts to rebel against these circumstances are known to have occurred in 689–90 and in 694. Both of these revolts had quickly failed and thereafter little is known about their history prior to 869.

Beginning in 861, the Abbasid Caliphate was weakened by a period of severe disorder known as the Anarchy at Samarra, during which the central government in Abbasid Samarra was paralyzed by a struggle between the caliphs and the military establishment for control of the state. Throughout the 860s the various factions in the capital were distracted by this conflict, which resulted in the deaths of several caliphs, army commanders and bureaucrats, the outbreak of multiple troop riots, a damaging civil war in 865–866, and the virtual bankruptcy of the government.

Fascinating.  History is full of these major events (a fourteen year slave rebellion with more than 500,000 dead) tucked away with little notice in places and locations around the world.