Chandragupta's son Bindusara extended the rule of the Mauryan empire towards southern India. The famous Tamil poet Mamulanar of the Sangam literature described how areas south of the Deccan Plateau which comprised Tamil country was invaded by the Maurya army using troops from Karnataka. Mamulanar states that Vadugar (people who resided in Andhra-Karnataka regions immediately to the north of Tamil Nadu) formed the vanguard of the Mauryan army. He also had a Greek ambassador at his court, named Deimachus. According to Plutarch Chandragupta Maurya subdued entire India, Justin also observed that chandragupta maurya was in possession of India; this is corroborated by Tamil sangam literature which mentions about Mauryan invasion with their south Indian allies and defeat of their rivals at Podiyil hill in Tirunelveli district in present-day Tamil Nadu.