Foundation of the Empire
Relations with the Hellenistic world may have started from the very beginning of the Maurya Empire. Plutarch reports that Chandragupta Maurya met with Alexander the Great, probably around Taxila in the northwest:
"Sandrocottus, when he was a stripling, saw Alexander himself, and we are told that he often said in later times that Alexander narrowly missed making himself master of the country, since its king was hated and despised on account of his baseness and low birth". Plutarch 62-3
Reconquest of the Northwest (c. 310 BCE)
Chandragupta ultimately occupied Northwestern India, in the territories formerly ruled by the Greeks, where he fought the satraps (described as "Prefects" in Western sources) left in place after Alexander (Justin), among whom may have been Eudemus, ruler in the western Punjab until his departure in 317 BCE or Peithon, son of Agenor, ruler of the Greek colonies along the Indus until his departure for Babylon in 316 BCE.
"India, after the death of Alexander, had assassinated his prefects, as if shaking the burden of servitude. The author of this liberation was Sandracottos, but he had transformed liberation in servitude after victory, since, after taking the throne, he himself oppressed the very people he has liberated from foreign domination" Justin XV.4.12–13
"Later, as he was preparing war against the prefects of Alexander, a huge wild elephant went to him and took him on his back as if tame, and he became a remarkable fighter and war leader. Having thus acquired royal power, Sandracottos possessed India at the time Seleucos was preparing future glory." Justin XV.4.19
Conflict and alliance with Seleucus (305 BCE)
Silver coin of Seleucus I Nicator, who fought Chandragupta Maurya, and later made an alliance with him.
Seleucus I Nicator, the Macedonian satrap of the Asian portion of Alexander's former empire, conquered and put under his own authority eastern territories as far as Bactria and the Indus (Appian, History of Rome, The Syrian Wars 55), until in 305 BCE he entered in a confrontation with Chandragupta:
"Always lying in wait for the neighboring nations, strong in arms and persuasive in council, he [Seleucus] acquired Mesopotamia, Armenia, 'Seleucid' Cappadocia, Persis, Parthia, Bactria, Arabia, Tapouria, Sogdia, Arachosia, Hyrcania, and other adjacent peoples that had been subdued by Alexander, as far as the river Indus, so that the boundaries of his empire were the most extensive in Asia after that of Alexander. The whole region from Phrygia to the Indus was subject to Seleucus". Appian, History of Rome, The Syrian Wars 55
Though no accounts of the conflict remain, it is clear that Seleucus fared poorly against the Indian Emperor as he failed in conquering any territory, and in fact, was forced to surrender much that was already his. Regardless, Seleucus and Chandragupta ultimately reached a settlement and through a treaty sealed in 305 BCE, Seleucus, according to Strabo, ceded a number of territories to Chandragupta, including southern Afghanistan and parts of Persia.
Accordingly, Seleucus obtained five hundred war elephants, a military asset which would play a decisive role at the Battle of Ipsus in 301 BCE.
Marital alliance
It is generally thought that Chandragupta married Seleucus's daughter, or a Greek Macedonian princess, a gift from Seleucus to formalize an alliance. In a return gesture, Chandragupta sent 500 war elephants, a military asset which would play a decisive role at the Battle of Ipsus in 302 BC.
In addition to this treaty, Seleucus dispatched an ambassador, Megasthenes, to Chandragupta, and later Deimakos to his son Bindusara, at the Mauryan court at Pataliputra (modern Patna in Bihar state). Later Ptolemy II Philadelphus, the ruler of Ptolemaic Egypt and contemporary of Ashoka the Great, is also recorded by Pliny the Elder as having sent an ambassador named Dionysius to the Mauryan court.
Mainstream scholarship asserts that Chandragupta received vast territory west of the Indus, including the Hindu Kush, modern day Afghanistan, and the Balochistan province of Pakistan. Archaeologically, concrete indications of Mauryan rule, such as the inscriptions of the Edicts of Ashoka, are known as far as Kandahar in southern Afghanistan.
“ "He (Seleucus) crossed the Indus and waged war with Sandrocottus [Maurya], king of the Indians, who dwelt on the banks of that stream, until they came to an understanding with each other and contracted a marriage relationship." ”
“ "After having made a treaty with him (Sandrakotos) and put in order the Orient situation, Seleucos went to war against Antigonus." ”
—Junianus Justinus, Historiarum Philippicarum libri XLIV, XV.4.15
The treaty on "Epigamia" implies lawful marriage between Greeks and Indians was recognized at the State level, although it is unclear whether it occurred among dynastic rulers or common people, or both
Should the Mauryan Empire be in Rome II?
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Originally Posted by Wetblowdryer
There are some parts, but not like Egypt, or Carthaginian lands 
