Due to its location, the Punjab region came under constant attack and influence from the west and witnessed centuries of foreign invasions by the Greeks, Kushans, Scythians, Turks, Arabs, and Afghans. The city of Taxila, claimed to have been founded by Taksh the son of Bharat who was the brother of Ram. It was reputed to house the oldest university in the world, Takshashila University. One of the teachers was the great Vedic thinker and politician Chanakya. Taxila was a great centre of learning and intellectual discussion during the Maurya Empire. It is a UN World Heritage site, valued for its archaeological and religious history.