The Seleucid–Mauryan War was a confrontation between the Seleucid and Mauryan empires that took place sometime between 305 and 303 BCE, when Seleucus I Nicator of the Seleucid Empire crossed the Indus river into the former Indian satrapies of the Macedonian Empire, which had been conquered by Emperor Chandragupta Maurya of the Maurya Empire.
The confrontation resulted in a dynastic marriage-alliance between Seleucus and Chandragupta, the gift of war elephants to Seleucus, and the transferring of control over the Indus Valley region and (possibly) part of Afghanistan to Chandragupta. The alliance freed Seleucus to turn his attention toward his rivals in the west, while Chandragupta secured control over the areas that he had sought, the Maurya Empire emerging as the dominant power of the Indian subcontinent.
