Daulatabad, ancient Devgiri(Maharashtra). The fort and the town-ship (today spread over an area of approximately six square miles) were erected by the Yadav kings Bhillam and Jaitugi by the end of the 1 2th century. The closing years of the next century witnessed the collapse of Yadav power and its eventual replacement by the governors of the Delhi Sultans.

The most remarkable incident in the life of Daulatabad was its elevation to the status of an imperial capital by Muhammad bin Tughluq. This honour was enjoyed for no more than half a dozen years, but the city continued to be the capital of the regional sultanates that sprang up on the withdrawal of the Delhi forces. The official biographers of the emperor state that an entirely new city was laid out, and at least part of it was made ready to receive the population of Delhi, transferred here under Imperial orders (Husain 1963: 591-2). If these accounts are to be believed, the Daulatabad of 1328 must have been a model of town-planning. With separate wards for different classes of people, each well marked out and self-sufficient, and the whole encircledb y massiver amparts, it was an ideal town. 

Source: http://www.jstor.org/pss/124346