Ajmer is surrounded by the Aravalli Mountains. Ajmer is located 135 kilometres west of Jaipur, 274 km from Udaipur, 439 km from Jaisalmer, and 391 km from Delhi. Ajmer is a pilgrimage centre for the shrine of the Sufi Saint Khwaja Moinuddin Chishti and is also the base for visiting Pushkar (11 km), an ancient Hindu pilgrimage city, famous for the temple of Brahma. According to Rajputana Gazetteer, Ajmer was held by Chechi Gurjars until about 700 years ago. Ajmer (Sanskrit Ajayameru) was founded in the late 7th century A.D. by Ajayraj singh Chauhan. Chauhan clan is a branch of Chechi Gurjars. The Chauhan dynasty ruled Ajmer in spite of repeated invasions by Turkic Muslim armies from Central Asia across the north of India. Prithvi Raj III, known as Prithviraj Chauhan (1149–1192 CE), was a king of the Hindu Chauhan (Chauhamana) dynasty, who ruled the kingdom of Ajmer during the latter half of the 12th century. Prithviraj Chauhan belonged to the Rajput Chauhan clan, which according to a legend mentioned in later manuscripts of Prithviraj Raso was part of Agnivanshi Rajputs, derived its origin from a sacrificial fire-pit. The cancellation depicts Prithviraj Chauhan Smarak (Memorial).