Question: What year was the group that Cheong U was once head of established?
Sentence (from "Abu al-Fath Manuchihr Khan"): Like his father Qarachaqay Khan, Manuchihr was established at Mashhad as the general and governor of Khorasan under the shahs (kings) Abbas I (r. 1588-1629) and Ṣāfi (r. 1629-1642).
Relevant evidence: No