In which historical civilization is Assassin's Creed Odyssey primarily set?

Assassin's Creed Odyssey is primarily set in Ancient Greece.

The game takes place during the Peloponnesian War, a conflict between Athens and Sparta that began in 431 BCE. Players explore mainland Greece and numerous Aegean islands while taking part in quests involving politics, warfare, mythology, and the wider family story of the protagonist.

Assassin's Creed Odyssey was released in 2018. Players can choose Alexios or Kassandra as the playable mercenary, although the game's canonical novelization identifies Kassandra as the protagonist. The game also includes naval travel and battles across the Aegean Sea.

Odyssey is often confused with Origins because both games portray the ancient Mediterranean. Origins is set mainly in Ptolemaic Egypt, while Odyssey focuses on Greece during the classical period and the Peloponnesian War.