Maurya Empire
Chandragupta Maurya

After the death of Alexander the Great in 323 BCE, Chandragupta led a series of campaigns in 305 BCE to take satrapies in the Indus Valley and northwest India. When Alexander's remaining forces were routed, returning westwards, Seleucus I Nicator fought to defend these territories. Not many details of the campaigns are known from ancient sources. Seleucus was defeated and retreated into the mountainous region of Afghanistan.

The two rulers concluded a peace treaty in 303 BCE, including a marital alliance. Under its terms, Chandragupta received the satrapies of Paropamisadae (Kamboja and Gandhara) and Arachosia (Kandahar Province) and Gedrosia (Balochistan). Seleucus I received the 500 war elephants that were to have a decisive role in his victory against western Hellenistic kings at the Battle of Ipsus in 301 BCE. Diplomatic relations were established and several Greeks, such as the historian Megasthenes, Deimachus and Dionysius resided at the Mauryan court.

Megasthenes in particular was a notable Greek ambassador in the court of Chandragupta Maurya. His book Indika is a major literary source for information about the Mauryan Empire. According to Arrian, ambassador Megasthenes (c. 350 – c. 290 BCE) lived in Arachosia and travelled to Pataliputra. Megasthenes' description of Mauryan society as freedom-loving gave Seleucus a means to avoid invasion, however, underlying Seleucus' decision was the improbability of success. In later years, Seleucus' successors maintained diplomatic relations with the Empire based on similar accounts from returning travellers.

Chandragupta established a strong centralised state with an administration at Pataliputra, which, according to Megasthenes, was "surrounded by a wooden wall pierced by 64 gates and 570 towers". Aelian, although not expressly quoting Megasthenes nor mentioning Pataliputra, described Indian palaces as superior in splendor to Persia 's Susa or Ecbatana. The architecture of the city seems to have had many similarities with Persian cities of the period.

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 Mauryan 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 all of India, and Justin also observed that Chandragupta Maurya was "in possession of India". These accounts are 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.

Chandragupta renounced his throne and followed Jain teacher Bhadrabahu. He is said to have lived as an ascetic at Shravanabelagola for several years before fasting to death, as per the Jain practice of sallekhana.
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