Qila Rohtas or the Rohtas Fort is an exceptional example of early Muslim military architecture in Central and South Asia, for it was built essentially for military purposes. Following the defeat of the Mughal Emperor Humayun in 1541, Sher Shah Suri built a strong fortified complex at Rohtas, a strategic site about 16 kilometres north-west of the city of Jhelum. The gigantic fort is founded on steep rocks jutting into the river Kahan, its ramparts protected on the west and north sides by the river and by high hills on its east and south. It was never taken by assault and survives intact to the present day. The main fortifications consist of the massive walls, which extended for more than 4km; they are lined with bastions and pierced by monumental gateways. There are indications that more structures had existed earlier, which either collapsed due to neglect, or were demolished in Mughal or later periods. The Rohtas Fort is now a protected monument under the Antiquities Act 1