Which Assassin's Creed game is set mainly during the Peloponnesian War?

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

The game takes place in ancient Greece from 431 to 422 BCE, during the long conflict between Athens and Sparta. The player controls either Alexios or Kassandra, descendants of King Leonidas I, and travels through mainland Greece and the Aegean world while becoming involved in political, family, and cult-related conflicts.

Odyssey includes historical figures such as Pericles, Socrates, and Alcibiades. It also begins with a playable sequence at the Battle of Thermopylae, which occurred decades before the main storyline and features Leonidas.

The setting is sometimes mixed up with Origins, which takes place in Ptolemaic Egypt several centuries later. Odyssey also stands out because it is set before the formal emergence of the Hidden Ones, the organization founded in Origins. Its title emphasizes exploration and the game’s branching role-playing structure.