Chattel slavery was a major institution and a significant part of the Ottoman Empire's economy and traditional society.
The main sources of slaves were wars and politically organized enslavement expeditions in the Caucasus, Eastern Europe, Southern Europe, Central Europe, Southeast Europe, the Western Mediterranean and Africa. It has been reported that the selling price of slaves decreased after large military operations.
Between 1441 and 1774, the Crimean Khanate and the Nogai Horde conducted slave raids throughout lands primarily controlled by Russia and Poland–Lithuania. Concentrated in Eastern Europe, but also stretching to the Caucasus and parts of Central Europe, these raids were often supported by the Ottoman Empire and involved the transportation of European men, women, and children to the Muslim world, where they were put on the market and sold as part of the Crimean slave trade and the Ottoman slave trade. The regular abductions of people over the course of numerous incursions by the Crimeans and the Nogais greatly drained Eastern Europe's human and economic resources, consequently playing an important role in the emergence of the semi-militarized Cossacks, who organized retaliatory campaigns against the raiders and their Ottoman backers.
Trading posts in Crimea had previously been established by the Genoese and the Venetians to facilitate earlier Western European slave routes. The Crimean–Nogai raids largely targeted the "Wild Fields" of the Pontic–Caspian steppe, which extends about 800 kilometres (500 mi) north of the Black Sea and which now contains the majority of the combined population of southeastern Ukraine and southwestern Russia.
The history of slavery in the Muslim world was throughout the history of Islam with slaves serving in various social and economic roles, from powerful emirs to harshly treated manual laborers. Slaves were widely in labour in irrigation, mining, and animal husbandry, but most commonly as soldiers, guards, domestic workers. The use of slaves for hard physical labor early on in Muslim history led to several destructive slave revolts, the most notable being the Zanj Rebellion of 869–883. Many rulers also used slaves in the military and administration to such an extent that slaves could seize power, as did the Mamluks.
Most slaves were imported from outside the Muslim world. Slavery in the Muslim world did not have a racial foundation in principle, although this was not always the case in practice. The Arab slave trade was most active in West Asia, North Africa (Trans-Saharan slave trade), and Southeast Africa (Red Sea slave trade and Indian Ocean slave trade), and rough estimates place the number of Africans enslaved in the twelve centuries prior to the 20th century at between six million to ten million. The Ottoman slave trade came from raids into eastern and central Europe and the Caucasus connected to the Crimean slave trade, while slave traders from the Barbary Coast raided the Mediterranean coasts of Europe and as far afield as the British Isles and Iceland.
The Palace School (Enderun-i Hümayun Mektebi) was a special school inside of the innermost court of Topkapı Palace that provided the education for the servants (slaves) of the Ottoman dynasty, who went on to staff the administrative elite of the Ottoman Empire. These were converts to Islam, young males between 8 and 20 years old, who were mostly taken away from the rural Christian communities settled in Rumelia in an enslavement process known as devşirme.
The most promising of the latter were sent to the school located in the grounds of the imperial Topkapı Palace, where they studied law, linguistics, religion, music, art, and fighting, as well as performing functions as palace staff.
Pargalı Ibrahim Pasha (c. 1495 – 15 March 1536), was the first Grand Vizier of the Ottoman Empire appointed by Sultan Suleiman the Magnificent.
Ibrahim, born as Orthodox Christian, was enslaved during his youth. He and Suleiman became close friends in their youth. In 1523, Suleiman appointed Ibrahim as grand vizier to replace Piri Mehmed Pasha, who had been appointed in 1518 by Suleiman's father, the preceding Sultan Selim I. Ibrahim remained in office for the next 13 years. He attained a level of authority and influence rivaled by only a handful of other grand viziers of the Empire, but in 1536, he was executed on Suleiman's orders and his property (much of which was gifted to him by the Sultan) was confiscated by the state.
The Chios massacre (Greek: Η σφαγή της Χίου, pronounced [i sfaˈʝi tis ˈçi.u]) was a catastrophe that resulted in the death, enslavement, and flight of about four-fifths of the total population of Greeks on the island of Chios by Ottoman troops during the Greek War of Independence in 1822. It is estimated that up to 100,000 people were killed or enslaved during the massacre, while up to 20,000 escaped as refugees. Greeks from neighboring islands had arrived on Chios and encouraged the Chiotes (the native inhabitants of the island) to join their revolt. In response, Ottoman troops landed on the island and killed thousands. The massacre of Christians provoked outrage across the Western world and led to increasing support for the Greek cause worldwide.
The Ottoman Imperial Harem (Ottoman Turkish: حرم همايون, romanized: Harem-i Hümâyûn, lit. 'Imperial Harem') of the Ottoman Empire was the Ottoman sultan's harem – composed of the wives, servants (both female slaves and eunuchs), female relatives and the sultan's concubines – occupying a secluded portion (seraglio) of the Ottoman imperial household. This institution played an important social function within the Ottoman court, and wielded considerable political authority in Ottoman affairs, especially during the long period known as the Sultanate of Women (approximately 1534 to 1683).
Historians claim that the sultan was frequently lobbied by harem members of different ethnic or religious backgrounds to influence the geography of the Ottoman wars of conquest. The utmost authority in the imperial harem, the valide sultan, ruled over the other women in the household. The consorts of the sultan were normally of slave origin, including the valide sultan.
The rayah or reaya was a member of the tax-paying lower class of Ottoman society, in contrast to the askeri (military) and kul (slaves, including Janissaries). Ottoman subjects were initially divided into roughly two taxable classes, the military class (askeri) and working class (rayah). The term was attributed to the peasant tax-paying subjects of the Timariots, active until the disintegration of the timar system in the 16th century. A clear social distinction was made between the Muslim and Christian rayah, with legal and religious discrimination against the latter, viewed of as infidels (giaour). Although the term initially and generally was used to encompass all of the subject lower class (taxed Muslims, Christians and Jews), it was particularly attributed to the Christian (also called zimmi), mostly Eastern Orthodox communities (the Rum Millet) in the Balkans (Rumelia).
The Kizlar Agha (Ottoman Turkish: قيزلر اغاسی, Turkish: kızlar ağası, lit. '"agha of the girls"'), formally the Agha of the House of Felicity (Ottoman Turkish: دار السعاده اغاسي, Turkish: Darüssaade Ağası), was the head of the eunuchs who guarded the Ottoman Imperial Harem in Constantinople.
Established in 1574, the post ranked among the most important in the Ottoman Empire until the early 19th century, especially after the stewardship of the two holy cities of Mecca and Medina and the supervision of all waqfs (charitable foundations) in the Empire came under his purview. The wealth thus amassed, the proximity to the sultan, and the role the harem ladies played in court intrigues ("Sultanate of Women") meant that its occupant had considerable political influence; several kızlar aghas were responsible for the downfall of grand viziers and the accession of sultans. Soon after its creation and until its abolition, close to the abolition of the Ottoman sultanate, the post came to be occupied by Black African eunuch slaves, and hence is also referred to as the Chief Black Eunuch.