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Mauryan empire, in ancient India, a state centred at Pataliputra (later Patna) near the junction of the Son and Ganges (Ganga) rivers. It lasted from about 321 to 185 bce and was the first empire to encompass most of the Indian subcontinent. The Mauryan empire was an efficient and highly organized autocracy with a standing army and civil service. That bureaucracy and its operation were the model for the Artha-shastra (“The Science of Material Gain”),...