Explanation:

After ousting the Huns, king Harshavardhana established his capital at Thanesar near Kurukshetra in the 7th century CE. After his death, the kingdom of his clansmen, the Pratiharas ruled over a vast region for quite a while from Harsha's adopted capital Kannauj. The region remained strategically important for the rulers of North India even though Thanesar was no more as central as Kannauj. Prithviraj Chauhan established forts at Taraori and Hansi in the 12th century. Muhammad Ghori conquered this area in the Second Battle of Tarain. Following his death, the Delhi Sultanate was established that ruled much of India for several centuries.