During which war is Assassin's Creed Odyssey primarily set?

Assassin's Creed Odyssey is primarily set during the Peloponnesian War.

The game begins in 431 BCE, the year the war between Athens and Sparta traditionally began. Players control a mercenary named Alexios or Kassandra and travel through the Greek world while becoming involved in political, military, and family conflicts.

The Peloponnesian War lasted from 431 to 404 BCE, with interruptions and shifting alliances. Its main opposing powers were the Athenian Empire and the Peloponnesian League led by Sparta. Odyssey uses this historical conflict as its setting but adds fictional characters, myth-inspired elements, and an original personal storyline.

The game is not set during the later Roman conquest of Greece or the earlier Persian Wars. Historical figures such as Pericles, Socrates, and Hippocrates appear, placing the story firmly in classical Greece during the fifth century BCE.