The Arab and Islamic Slave Trade: 1,300 Years, 10–18 Million Enslaved — The History That Does Not Make Headlines

When Western institutions discuss slavery, discussion is overwhelmingly focused on the Atlantic slave trade — the transportation of approximately 12 million Africans to the Americas primarily by European and American traders between roughly 1500 and 1900. This trade is the subject of museum exhibitions, academic departments, reparations legislation, monument debates, and extensive historical literature.

The Arab and Islamic slave trade — which preceded the Atlantic trade by 800 years, operated for 1,300 years total, enslaved a comparable or larger number of people, and included distinctive practices of systematic castration and suppression of reproduction — receives a fraction of the scholarly and public attention. This disparity is itself a historical and political fact worth examining.

Historians' estimates of the Arab and Islamic slave trade vary, but the ranges are consistent across several independent research streams:

Trans-Saharan trade (Africa → Arab world):

• Ralph Austen (University of Chicago): estimates 9.85 million Africans moved across the Sahara between 650 CE and 1900
• Paul Lovejoy: estimates 9 million in the trans-Saharan trade
• Ronald Segal ('Islam's Black Slaves', 2001): estimates a total of 11.5 million Africans taken into the Islamic world from the 7th century through the late 19th century
• Murray Gordon ('Slavery in the Arab World', 1989): similar estimates, 10–14 million

The Barbary/Ottoman trade (Europeans enslaved):

• Robert Davis (Ohio State University), 'Christian Slaves, Muslim Masters' (2003): estimates 1 to 1.25 million Europeans were captured and enslaved by North African corsairs between 1500 and 1800, primarily from Spain, Portugal, Italy, France, England, and the Netherlands
• These European slaves worked as galley rowers, builders, domestic servants, and concubines; many were held for ransom

Combined, the Arab and Islamic slave trade enslaved between 10 and 18 million people — a number comparable to, and by some estimates exceeding, the Atlantic trade.

The Arab trade had several features that distinguished it from the Atlantic trade:

Systematic castration: A significant proportion of male African slaves transported to the Arab world were castrated to serve as harem guards (eunuchs). The castration process had a high mortality rate — some historians estimate 80–90% of those castrated died from the procedure. This means that the actual number of Africans subjected to the trade was substantially higher than the number who survived to be counted as slaves. The prevalence of castration also explains the near-absence of large African-descended diaspora populations in Arab countries comparable to the Black populations of the Americas — surviving male slaves could not reproduce.

Duration and continuity: The Arab slave trade began with the early Islamic conquests in the 7th century and continued in some regions through the early 20th century. Saudi Arabia legally abolished slavery in 1962. Mauritania abolished it in 1981 (and again, more seriously, in 2007). Estimates suggest that hundreds of thousands of people remained in conditions of chattel slavery in parts of Africa and the Arabian Peninsula into the 1960s and 1970s.

Source populations: The Arab trade drew from sub-Saharan Africa (the primary source), East Africa (the Swahili coast and Ethiopia), Central Asia, and Europe. The diversity of source populations makes the trade harder to frame through a single racial lens, which may partially explain its reduced prominence in contemporary discourse that focuses on anti-Black racism.

Religious sanction: Classical Islamic jurisprudence permitted enslavement of non-Muslims taken in conquest, and of the children of existing slaves. This religious sanction — which was never absolute and was subject to considerable theological debate within Islam — provided a framework that made abolition more complicated than in Christian-dominated Western societies, where abolitionists could and did argue that slavery violated Christian principles.

The disparity in attention between the Atlantic and Arab slave trades reflects several factors:

Political framing: Contemporary discussions of slavery in Western countries focus primarily on the relationship between Black people and white European/American institutions. The Arab trade does not fit neatly into this framework because the perpetrators were Arab (not white European) and the institutional structures of Middle Eastern governance are not the primary targets of contemporary social justice campaigns.

Absence of diaspora advocacy: The Atlantic slave trade created large African-descended diaspora populations in the Americas whose descendants are active participants in contemporary political life and whose historical memory of slavery is immediate and generationally transmitted. The Arab trade largely prevented the formation of comparable diaspora populations through castration and other means, so there is no comparable advocacy community.

Academic specialization: Trans-Saharan and Arab slave trade research is a specialist field largely housed in African Studies and Middle Eastern Studies programs, with less institutional momentum than African-American Studies.

Diplomatic sensitivities: Many Arab and Muslim-majority countries are important diplomatic and economic partners for Western governments and media organizations. Critical coverage of the Arab slave trade is perceived as potentially damaging to those relationships in a way that coverage of European and American slavery history is not.

None of these explanations justify the disparity. A historically accurate account of human trafficking, coercion, and mass suffering requires engaging with the Arab and Islamic slave trade with the same seriousness applied to the Atlantic trade.