Chauhan, a name derived from the historical Chahamanas, a clan name associated with various ruling Rajput families in the present-day Indian state of Rajasthan from seventh century onwards.[1]
When Gurjara Pratiharas power declined after the sacking of Kannauj by the Rashtrakutkas in the early tenth century many Rajput princes declared their independence and founded their own kingdoms, some of which grew to importance in the subsequent two centuries. The better known among these dynasties were the Chaulukyas or Solankis of Kathiawar and Gujarat, the Chahamanas (i.e. Chauhan) of eastern Rajasthan (Ajmer and Jodhpur), and the Tomaras who had founded Delhi (Dhillika) in 736 but had then been displaced by the Chauhans in the twelfth century.
The period between the seventh and the twelfth century witnessed gradual rise of a number of new royal-lineages in Rajasthan, Gujarat, Madhya Pradesh and Uttar Pradesh, which came to constitute a social-political category known as 'Rajput'. Some of the major lineages were the Pratiharas of Rajasthan, Uttar Pradesh and adjacent areas, the Guhilas and Chahamanas of Rajasthan, the Caulukyas or Solankis of Gujarat and Rajasthan and the Paramaras of Madhya Pradesh and Rajasthan.
This is curious statement for the Chahamanas who were known to be one of the eminent Rajput family of early medieval period
By contrast in Rajasthan a single warrior group evolved called Rajput (from Rajaputra-sons of kings): they rarely engaged in farming, even to supervise farm labour as farming was literally beneath them, farming was for their peasant subjects. In the ninth century separate clans of Rajputs Cahamanas (Chauhans), Paramaras (Pawars), Guhilas (Sisodias) and Caulukyas were splitting off from sprawling Gurjara Pratihara clans...
The Tomaras ultimately met their destruction at the hand of another Rajput clan, the Chauhans or Chahamanas. Delhi was captured from the Tomaras by the Chauhan king Vigraharaja IV (the Visala Deva of the traditional bardic histories) in the middle of twelfth century
The Chauhans (Cahamanas) Rajputs had emerged in the later tenth century and established themselves as a paramount power, overthrowing the Tomar Rajputs. In 1151 the Tomar Rajput rulers (and original builders) of Delhi were overthrown by Visal Dev, the Chauhan ruler of Ajmer