Saqaliba (, singular ) is a term used in medieval Arabic sources to refer to Slavs, and other peoples of Central, Southern, and Eastern Europe. The term originates from the Middle Greek slavos/sklavenos (Slav), which in Hispano-Arabic came to designate first Slavic slaves and then, similarly to the semantic development of the term in other West-European languages, foreign slaves in general. The word was often used to refer specifically to Slavic slaves, but it could also refer more broadly to Central, Southern, and Eastern Europeans traded by the Arab traders.
There were several major routes for the trading of Slavic slaves into the Arab world: through Central Asia (Mongols, Tatars, Khazars, etc.) for the East Slavs; through the Balkans for the South Slavs; through Central and Western Europe for the West Slavs and to al-Andalus. The Volga trade route and other European routes, according to Ibrahim ibn Jakub (10th century), were serviced by Radanite Jewish merchants. (Compare Crimean–Nogai raids into East Slavic lands.) Theophanes mentions that the Umayyad caliph Muawiyah I settled a whole army of 5,000 Slavic mercenaries in Syria in the 660s. After the battle of Sebastopolis in 692, Neboulos, archon of the Slavic corps in the Byzantine army, and 30,000 of his men were settled by the Umayyads in the region of Syria.
In the Arab world, the Saqaliba served or were forced to serve in a multitude of ways: as servants, harem concubines, eunuchs, craftsmen, mercenaries, slave soldiers, and as Caliph's guards. In Iberia, Morocco, Damascus and Sicily, their military role may be compared with that of mamluks in the Ottoman Empire. In al-Andalus, Slavic eunuchs were so popular and widely distributed that they became synonymous with the term Saqāliba, though not all Saqaliba were eunuchs. Some Saqāliba became rulers of taifas (principalities) in Iberia after the collapse of the Caliphate of Cordoba in 1031. For example, Mujāhid al-ʿĀmirī organized the Saqaliba in Dénia to rebel, seize control of the city, and establish the Taifa of Dénia (1010–1227), which extended its reach as far as the island of Majorca.
Saqaliba slave trade
Slavic slaves
The Volga trade route was established by the Varangians (Vikings) who settled in Northwestern Ruthenia in the early 9th century. About south of the Volkhov River entry into Lake Ladoga, they established a settlement called Ladoga (Old Norse: Aldeigjuborg). It connected Northern Europe and Northwestern Ruthenia with the Caspian Sea, via the Volga River. The Rus used this route to trade with Muslim countries on the southern shores of the Caspian Sea, sometimes penetrating as far as Baghdad. The route functioned concurrently with the Dnieper trade route, better known as the trade route from the Varangians to the Greeks, and lost its importance in the 11th century.
Saqaliba originally was used to denote Slavic people, however later it came to denote all European slaves in some Muslim regions like Spain including those abducted from raids on Christian kingdoms of Spain. The Franks started buying slaves from the Slavs and Avar Khaganate while Muslims also came across slaves in the form of mercenaries serving the Byzantine Empire and settlers in addition to among the Khazars. Most Slavic slaves were imported to the Muslim world through the border between Christian and Islamic kingdoms where castration centres were also located instead of the direct route. From there they were sent into Islamic Spain and other Muslim-ruled regions especially North Africa. The saqaliba gained popularity in Umayyad Spain especially as warriors. After the collapse of the Umayyads, they also came to rule over many of the taifas. With the conversion of Eastern Europe, the trade declined and there isn't much textual information on saqaliba after 11th century.
Central Europe was the most favoured destination for importation of slaves alongside Central Asia and Bilad as-Sudan, though slaves from Northwestern Europe were also valued. This slave trade was controlled mostly by European slave traders. France and Venice were the routes used to send Slavic slaves to Muslim lands and Prague served as a major centre for castration of Slavic captives. The Emirate of Bari also served as an important port for this trade. Due to the Byzantine Empire and Venice blocking Arab merchants from European ports, they later started importing in slave from the Caucasus and the Caspian Sea.