Which Assassin's Creed game takes place during the Peloponnesian War in ancient Greece?

Assassin's Creed Odyssey takes place during the Peloponnesian War in ancient Greece.

Released in 2018, Odyssey is set mainly between 431 and 422 BCE, during the conflict between Athens and Sparta. The player controls Kassandra or Alexios, mercenaries descended from the Spartan king Leonidas I.

The game presents a large explorable version of the Greek world, including Athens, Sparta, the Aegean islands, and other regions. Players make dialogue choices, pursue quests, and influence parts of the story through branching decisions.

Odyssey is set before Assassin's Creed Origins and explores the origins of the Isu-linked Staff of Hermes Trismegistus. Although it includes the franchise's Templar-related mythology, the historical setting predates the formal Assassin Brotherhood by centuries.