Maurya Empire
Conflict and alliance with Seleucus (305 BCE)

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 into a confrontation with Emperor Chandragupta:

Always lying in wait for the neighbouring nations, strong in arms and persuasive in council, he 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.

Though no accounts of the conflict remain, it is clear that Seleucus fared poorly against the Indian Emperor as he failed to conquer 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 eastern Afghanistan and Balochistan.
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