Thanesar in the context of "Aryavarta"

Prithviraja III (IAST: Pṛthvī-rāja; 28 May 1166 – February 1192), popularly known as Prithviraj Chauhan or Rai Pithora, was a king from the Chauhan (Chahamana) dynasty who ruled the territory of Sapadalaksha, with his capital at Ajmer in present-day Rajasthan in north-western India. Ascending the throne as a minor in 1177 CE, Prithviraj inherited a kingdom which stretched from Thanesar in the north to Jahazpur (Mewar) in the south, which he aimed to expand by military actions against neighbouring kingdoms, most notably defeating the Chandelas.

Prithviraj led a coalition of several Rajput kings and defeated the Ghurid army led by Muhammad of Ghor near Taraori in 1191 However, in 1192, Muhammad returned with an army of Turkish mounted archers and defeated the Rajput army on the same battlefield. Prithviraj was captured and summarily executed, although his minor son Govindaraja was reinstated by Muhammad as his puppet ruler in Ajmer. His defeat at Tarain is seen as a landmark event in the Islamic conquest of India, and has been described in several semi-legendary accounts, most notably the Prithviraj Raso.

Harshavardhana (Sanskrit: हर्षवर्धन; 4 June 590 – 647) was an emperor of Kannauj from April 606 until his death in 647. He was the king of Thanesar who had defeated the Alchon Huns, and the younger brother of Rajyavardhana, son of Prabhakaravardhana and last king of Thanesar. He was one of the greatest kings of the Kingdom of Kannauj, which under him expanded into a vast realm in northern India.

At the height of Harsha's power, his realm covered much of northern and northwestern India, with the Narmada River as its southern boundary. He eventually made Kanyakubja (present-day Kannauj, Uttar Pradesh state) his imperial capital, and reigned until 647 CE. Harsha was defeated by the Emperor Pulakeshin II of the Chalukya dynasty in the Battle of Narmada, when he tried to expand his empire into the southern peninsula of India.

The Pushyabhuti dynasty (IAST: Puṣyabhūti), also known as the Vardhana dynasty, was the ruling dynasty of the Kingdom of Thanesar in northern India during the 6th and 7th centuries. The dynasty reached its zenith under its last ruler Harsha Vardhana (c. 590 – c. 647 CE), whose empire covered much of north and north-western India, extending till Kamarupa in the east and Narmada River in the south. The dynasty initially ruled from Sthanveshvara (modern-day Thanesar, Haryana), but Harsha eventually made Kanyakubja (modern-day Kannauj, Uttar Pradesh) his capital, from where he ruled until 647 CE.