After the victory at Chaeronea, Philip and Alexander marched unopposed into the Peloponnese, welcomed by all cities; however, when they reached Sparta , they were refused, but did not resort to war.  At Corinth , Philip established a "Hellenic Alliance" (modelled on the old anti-Persian alliance of the Greco-Persian Wars ), which included most Greek city-states except Sparta. Philip was then named Hegemon (often translated as "Supreme Commander") of this league (known by modern scholars as the League of Corinth ), and announced his plans to attack the Persian Empire .  
Until recently historians dismissed the story of the Styx water-poisoning as a fiction, possibly a political smear designed to harm Antipater and Cassander. Both were contestants for power in the era after Alexander’s death and had many enemies, especially Olympias, Alexander’s vengeful mother (who, perhaps to help foster the idea of Antipater’s family’s guilt, eventually had Iollas’ grave dug up and his ashes scattered to the wind). Even the idea that ordinary Greek river water could have toxic properties seemed absurd. In 1913 the distinguished classicist . Frazer declared that the waters the Greeks identified as the Styx, today called Blackwater or Mavroneri, contained no toxins and there the matter rested for almost a century.