Along with Eastern Europe and Africa, Central Asia was the third major source of slaves entering the Islamic world. The sale of Central Asian slaves caused a major forced migration in the world of 1000. Once they realized that skilled slave soldiers commanded a higher price than unskilled slaves, the Samanids established a school to train military slaves. The revenues from the slave trade made the Samanids so rich that they continued to mint silver coins with a high degree of purity until the continent-wide silver shortage cut off their silver supplies sometime after 1000.
