At the time of which treaty the Nashik region that contained the forts Salher and Mulher was firmly ...........

Explanation:

The Treaty of Purandar (1665) required Chhatrapati Shivaji Maharaj to cede 23 forts to the Mughals. Strategically important forts, which were fortified with garrisons, such as Sinhagad, Purandar, Lohagad, Karnala, and Mahuli were turned over to the Mughal empire. At the time of this treaty, the Nashik region, that contained the forts Salher and Mulher, was firmly in the Mughal Empire's hands since 1636.