Traditional Buddhist literature attributes foundation of Patna 490 BCE[34][35] as Ajatashatru, the king of Magadha, wanted to shift his capital from the hilly Rajagrha (today Rajgir) to a strategically chosen place to better combat the Licchavis of Vaishali.[36] He chose the site on the bank of the Ganges and fortified the area. Gautama Buddha travelled through this place in the last year of his life. He prophesied a great future for this place even as he predicted its ruin due to flood, fire and feud.[37] According to Dieter Schlingloff, the Buddhist accounts may have presented the grandeur of Patna as a prophecy and that its wooden fortifications unlike other early historic Indian cities indicate that it might be much older than thought but only archaeological excavation and C14 dates of its wooden palisades which is presently lacking may establish this.

mauryan empire

Megasthenes, the Indo-Greek historian and ambassador to the court of Chandragupta Maurya, gave one of the earliest accounts of the city. He wrote that the city was on the confluence of the rivers Ganga and Arennovoas (Sonabhadra – Hiranyawah) and was 14 kilometres (9 mi) long and 2.82 kilometres (1.75 mi) wide.[39][40] Megasthenes, the Greek ambassador to India, described the city as the greatest city on earth during its heyday.[41] The Shungas ultimately retained control of Pataliputra and ruled for almost 100 years. The Shungas were followed by the Kanvas and eventually by the Guptas.