Chahamanas of Shakambhari

The Chahamanas of Shakambhari (IAST: Cāhamāna), colloquially known as the Chauhans of Sambhar or Chauhans of Ajmer, were an Indian dynasty that ruled parts of present-day Rajasthan and neighbouring areas between the sixth and twelfth centuries in the Indian subcontinent. The territory ruled by them was known as Sapadalaksha. They were the most prominent ruling family of the Chauhan Rajput clan. 

The Chahamanas originally had their capital at Shakambhari (present-day Sambhar Lake Town). Until the 10th century, they ruled as Pratihara vassals. When the Pratihara power declined after the Tripartite Struggle, the Chahamana ruler Simharaja assumed the title Maharajadhiraja. In the early 12th century, Ajayaraja II moved the kingdom's capital to Ajayameru (modern Ajmer). For this reason, the Chahamana rulers are also known as the "Chauhans of Ajmer".

The Chahamanas fought several wars with their neighbors, including the Chaulukyas of Gujarat, the Tomaras of Delhi, the Paramaras of Malwa and the Chandelas of Bundelkhand. From 11th century onward, they started facing Muslim invasions, first by the Ghaznavids, and then by the Ghurids. The Chahamana kingdom reached its zenith under Vigraharaja IV in the mid-12th century. The dynasty's power effectively ended in 1192 CE, when the Ghurid invader Muhammad of Ghor defeated and executed Vigraharaja IV's nephew Prithviraj Chauhan.