Dakshashila/Taxila/Takshashila had the oldest university after Nippur, Mesopotamia (Iraq now)
Takshashila was known for its cosmopolitan character, and it is believed that students and scholars from other regions and countries, such as Persia, Greece, Central Asia, and other parts of the world, also came to Takshashila to study and learn. This indicates that there could have been a diverse mix of people from different ethnicities and cultural backgrounds living in Takshashila around 3000 years ago.
Scylax of Caryanda, an ancient Greek explorer and geographer, is believed to have traveled to India around 515 BCE. He was commissioned by the Persian king Darius I to explore the course of the Indus River and map the lands along its banks, as part of the Persian Empire's expansionist efforts. Scylax's account of his journey, titled "Periplus of Scylax," provides valuable information about the geography, people, and cultures of the region, including the area of the Indus River and the Indian Ocean.