at Ajmer Prithvi Raj III, commonly known as Prithvi Raj Chauhan, (1166-1192 CE) was a king of the Hindu Kshatriya Chauhan (Chauhamana) dynasty, who ruled the kingdom of Ajmer and Delhi in northern India during the latter half of the 12th century.

Prithvi Raj Chauhan belonged to the Agnikula clan of Rajput Kshatriyas, which according to several scholars, was of the Gurjar stock. Prithviraj Chauhan was the last independent Hindu king to sit upon the throne of DelhiCitation neededdate=January 2010. He succeeded to the throne in 1169 A.D. at the age of 20, and ruled from the twin capitals of Ajmer and Delhi which he received from his maternal grand-father Ballal Sen of the Sen Dynasty in Bengal. He controlled much of present-day Rajasthan and Haryana, and unified the Rajputs against Muslim invasions. His elopement with Samyukta (Sanyogita), the daughter of Jai Chandra Rathod, the Gahadvala king of Kannauj, in 1175, is a popular romantic tale in India, and is one of the subjects of the Prithviraj Raso, an epic poem composed by Prithvirajs court poet and friend, Chand Bardai.

Prithvi Raj defeated the Muslim ruler Sultan Shahabuddin Muhammad Ghauri in the First Battle of Tarain in 1191 CE. Ghauri attacked for a second time next year, and Prithvi Raj was defeated and captured at the Second Battle of Tarain in 1192 CE. Sultan Ghauri took Prithvi Raj to Ghazni, where he was executed. Ghauri After his defeat Delhi came under the control of Muslim rulers. Qila Rai Pithora in Delhi, also known as Pithoragarh, is named after him.