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The empire was established by Chandragupta Maurya assisted by Chanakya (Kautilya) in Magadha (in modern Bihar) when he overthrew the Nanda dynasty.
The Maurya Empire unified most of the Indian subcontinent into one state and was the largest empire ever to exist on the Indian subcontinent.
Ptolemy successfully defended Egypt by consolidated his position in Egypt and the surrounding areas during the Wars of the Diadochi (322–301 BC).