Assassin's Creed Odyssey is set mainly during which ancient Greek conflict?

Assassin's Creed Odyssey is set mainly during the Peloponnesian War. This conflict between Athens and Sparta lasted from 431 to 404 BCE and provides the game's broad historical setting.

The game follows a mercenary traveling through the Greek world, including Attica, the Peloponnese, the Aegean islands, and other regions. The player can choose Alexios or Kassandra as the central character, while the story presents political figures, battles, myths, and rival factions within an alternate historical narrative.

The Peloponnesian War was not a single continuous battlefield. It included changing alliances, naval campaigns, sieges, revolts, and pauses in fighting. Athens and Sparta led opposing alliances, although many Greek communities were involved. The historical war ended with an Athenian defeat and Spartan victory.

Odyssey also includes legendary creatures and supernatural elements, so it is not intended as a documentary account. Its historical framework is the late fifth century BCE, rather than the earlier Greco-Persian Wars or the later Roman-Punic conflicts.