Dehradun, also known as Dehra Doon, is the capital and the most populous city of the Indian state of Uttarakhand. It is the administrative headquarters of the eponymous district and is governed by the Dehradun MunFrom the Ancient to the medieval era, Delhi was ruled by the powerful Rajput dynasties of the Tomaras, Chauhans, Gautamas. The Delhi Sultanate is the name given for a series of five successive dynasties, which remained as a dominant power of Indian subcontinent with Delhi as their capital.icipal Corporation.