The protagonist's family in Assassin's Creed Odyssey is associated with the Greek city-state of Sparta.
Odyssey begins with the protagonist connected to Sparta and the family of King Leonidas I. Players choose to play as Alexios or Kassandra, while the selected character becomes a mercenary traveling through the Greek world during the Peloponnesian War. Sparta is therefore the family and opening connection, although the adventure later visits many regions and settlements, including Athens.
Athens is a crucial location in the game, but it is not the answer to the family-association question. Sparta and Athens were rival powers in the real Peloponnesian War, which lasted from 431 to 404 BCE. Odyssey's story is set in the fifth century BCE and includes a fictionalized version of this conflict. Leonidas's appearance in the opening prologue links the player's family history to the famous Spartan king, while the wider narrative combines historical figures, mythology, and original characters.