In 1566, Shah Tahmasp I (r. 1524–1576) selected the Astarki chieftain Tajmir as ilkhan of the Bakhtiyari. He was, however, later killed and succeeded by Jahangir Khan Bakhtiyari, who is responsible for splitting the Bakhtiyaris into two groups, the Haft Lang and Chahar Lang. By the time of the reign of Shah Abbas I (r. 1588–1629), the northern part of Lur-i Buzurg became known as Bakhtiyari.