There was a diamond mine near a village on the river Ganges.
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Ajatasatru, with the help of his two ministers Sunidha and Vassakāra, built a fort near the banks of the river Ganges to strengthen the defense of Magadha and named it Pātali Grama(village).
He was called Ajatasatru by the people simply because he was the only politician who could move without gunman's security in the 'faction infested' Rayalaseema.
), adjacent to modern-day Patna, was a city in ancient India, originally built by Magadha ruler Ajatasatru in 490 BCE as a small fort (Pāṭaligrama) near River Ganges.
Because the spot was protected by two parallel ridges, Ajatasatru made it the capital of the north Indian empire Magadha in the 5th century BCE, naming it Rajgriha.