In which Assassin's Creed game can players choose Kassandra or Alexios as the protagonist?

Assassin's Creed Odyssey lets players choose Kassandra or Alexios as the protagonist.

Released in 2018, Odyssey is set in ancient Greece during the Peloponnesian War. At the beginning, the player selects either Kassandra or Alexios, who are siblings and descendants of the Spartan king Leonidas I. The selected character becomes the playable hero, while the other takes a different story role.

Kassandra is the canonical protagonist in later Assassin's Creed material, but the game itself allows either character to be chosen. This is why both names are valid player selections, while the requested answer identifies the game rather than one character.

Odyssey takes place before Origins in historical chronology. Its world includes Athens, Sparta, the Aegean islands, and myth-inspired locations connected to the First Civilization.