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Expansion of the Maurya Empire

With his new seat of power in Magadha, Chandragupta Maurya defeated the remaining Macedonian satraps and consolidated his reign of the new Maurya Empire. He rapidly expanded his power westward across central and western India, taking advantage of the disruptions of local powers in the wake of the withdrawal westward by Alexander the Great's Greek armies. By 320 BCE, the empire had fully occupied Northwestern India. Chandragupta Maurya would become the first emperor to unify India into one state, creating one of the world's largest empires in its time, and the largest ever in the Indian subcontinent.
In 305 BCE, Emperor Chandragupta Maurya led a series of campaigns to retake the satrapies left behind by Alexander the Great when he returned westward. Seleucus I fought to defend these territories, but both sides made peace in 303 BCE.
Seleucus, one of Alexander's generals, received Babylonia and, from there, expanded his dominions to include much of Alexander's near eastern territories. Seleucus established himself in Babylon in 312 BC, the year used as the foundation date of the Seleucid Empire. He ruled not only Babylonia but the entire enormous eastern part of Alexander's empire. The Seleucid Empire was a major center of Hellenistic culture. In the areas where a Greek-Macedonian political elite dominated (mostly urban), it maintained the preeminence of Greek customs.
In 305 BCE, Seleucus I tried to reconquer the northwestern parts of India in order to claim them for the growing Seleucid Empire. Little is known of the campaign in which Chandragupta fought with Seleucus over the Indus Valley and the region of Gandhara- a very wealthy kingdom that had submitted decades earlier to Alexander the Great.
Seleucus lost the Seleucid-Mauryan War, and the two rulers reconciled with a peace treaty. The Greeks offered a Macedonian princess for marriage to Chandragupta, and several territories, including the satrapies of Paropamisade (modern-day Kamboja and Gandhara), Arachosia (modern-day Kandhahar), and Gedrosia (modern-day Balochistan). In return, Chandragupta sent 500 war elephants, a military asset which would play a decisive role in Seleucus' victory against western Hellenistic kings at the Battle of Ipsus in 301 BCE.
In addition to this treaty, Seleucus dispatched two Greek ambassadors, Megasthenes and, later, Deimakos, to the Mauryan court at Pataliputra. Later, Ptolemy II Philadelphus, the ruler of Ptolemaic Egypt, sent an ambassador named Dionysius to the Mauryan court. Thus, continuing ties between the Hellenistic world and the Mauryan Empire.
Chandragupta Maurya ruled from 322 BCE until his voluntary retirement and abdication, in favor of his son, Bindusara, in 298 BCE. Bindusara (320-272 BCE) was the son of Maurya and his queen, Durdhara. During his reign, Bindusara expanded the Maurya Empire southward, with Chanakya as his advisor. He brought 16 states under the Maurya Empire and thus conquered almost all of the Indian peninsula. Bindusara ignored the friendly Dravidian kingdoms of the Cholas, ruled by King Ilamcetcenni, the Pandyas, and Cheras. Apart from these southern states, Kalinga (modern-day Odisha) was the only kingdom in India independent of Bindusara's empire.