In 552 a group called Turks who specialized in metalworking overthrew their overlords, the Rouruan, whose empire dominated the region from the eastern Silk Road cities of Central Asia through Mongolia. When the first Turkish khagan (ruler) died a few years later, the Turkish empire was divided between his younger brother, who took the western part (modern Central Asia), and his son, who took the eastern part (modern Mongolia). In 576 the Western Turks captured the Byzantine city of Bosporus in the Crimea.

The Eastern Turks frequently raided China and just as often fought among themselves. In the early seventh century the empire of the Eastern Turks ran up against the growing military might of the Tang Dynasty in China and soon broke apart.

In the eighth century a Turkic people called the Uighurs (Wee-gurs) formed a new empire based in Mongolia that survived about a century. It had close ties to Tang China, providing military aid but also extracting large payments in silk. During this period many Uighurs adopted religions then current along the Silk Road, notably Buddhism, Nestorian Christianity, and Manichaeism. In the ninth century this Uighur empire was destroyed by another Turkic people from north of Mongolia called the Kyrghiz. Some Uighurs fled to what is now western China. Setting up their capital city in Kucha, the Uighurs created a remarkably stable and prosperous kingdom that lasted four centuries (ca. 850–1250).

Farther west in Central Asia other groups of Turks rose to prominence. Often local Muslim forces would try to capture them, employ them as slave soldiers, and convert them. By the mid- to late tenth century many were serving in the armies of the Abbasid caliphate. Also in the tenth century Central Asian Turks began converting to Islam (which protected them from being abducted as slaves). Then they took to raiding unconverted Turks.

In the mid-eleventh century Turks had gained the upper hand in the caliphate, and the caliphs became little more than figureheads. From there Turkish power was extended into Syria, Palestine, and Asia Minor. In 1071 Seljuk Turks inflicted a devastating defeat on the Byzantine army in eastern Anatolia (see “The Ascendancy of the Turks” in Chapter 9). Other Turkish confederations established themselves in Afghanistan and extended their control into north India (see “The Delhi Sultanate”).

In India, Persia, and Anatolia the formidable military skills of nomadic Turkish warriors made it possible for them to become overlords of settled societies. Just as the Uighurs developed a hybrid urban culture along the eastern end of the Silk Road, the Turks of Central and West Asia created an Islamic culture that drew from both Turkish and Iranian sources. Often Persian was used as the administrative language of the states they formed. Nevertheless, despite the presence of Turkish overlords all along the southern fringe of the steppe, no one group of Turks was able to unite them all into a single political unit. That feat had to wait for the next major power on the steppe, the Mongols.