Question: Sergei Stadler and a Russian conductor of Circassian origin performed in which Orchestra?
Sentence (from "Qazaq Khan Cherkes"): Qazaq Khan Cherkes was a Safavid military commander of Circassian origin, who also served as the governor ("beglarbeg") of Shirvan (1624–1633) and Astarabad (1639–1640).
Relevant evidence: No