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The first ruler of the Mauryan dynasty was Chandragupta Maurya. He overthrew the last Nanda ruler in 321 BC.He was supported by his minister Chanakya, who was also known as Kautilya or Vishnugupta 
Next, he defeated Selecus Nicator, a general of threw Greek king, Alexander. Thereafter, he tried to strenghten his control over other parts of northern India