Seleucus I Nicator, a Macedonian satrap of Alexander, reconquered most of Alexander's former empire 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:
The exact details of engagement are not known. As noted by scholars such as R. C. Majumdar and D. D. Kosambi, Seleucus appears to have fared poorly, having ceded large territories west of the Indus to Chandragupta. Due to his defeat, Seleucus surrendered Arachosia, Gedrosia, Paropamisadae, and Aria.
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 Kandhahar in southern Afghanistan.
It is generally thought that Chandragupta married Seleucus's daughter, or a GreekMacedonianprincess, 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 BCE. 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.
Classical sources have also recorded that following their treaty, Chandragupta and Seleucus exchanged presents, such as when Chandragupta sent various aphrodisiacs to Seleucus:
" | "And Theophrastus says that some contrivances are of wondrous efficacy in such matters [as to make people more amorous]. And Phylarchus confirms him, by reference to some of the presents which Sandrakottus, the king of the Indians, sent to Seleucus; which were to act like charms in producing a wonderful degree of affection, while some, on the contrary, were to banish love." |