What is "simjurids"

The Simjurids were a Turkic family that served the Samanid emirs (also transliterated as amirs, aamirs or ameers) of Bukhara in the 10th century. They played an influential role in the history of eastern Iran and southern Afghanistan during that time, and by the second half of the 10th century they had built a semi-independent principality in Khurasan.