Sparta is the ancient Greek city-state where Kassandra is born in Assassin's Creed Odyssey.
Kassandra is presented as the canonical protagonist of Odyssey in later official series material. She is the daughter of Nikolaos of Sparta and grows up connected to the city's warrior culture. Her family history drives much of the campaign, which begins in the Greek world during the Peloponnesian War.
Odyssey takes place in the fifth century BCE, with Athens and Sparta leading opposing alliances. The open world includes mainland Greece, the Aegean islands, and locations connected to mythology and classical history. Players may choose Alexios as the playable character, but Kassandra remains the canon choice established by subsequent Assassin's Creed references.
Athens is one of the game's largest and most important cities, so it is a common mistaken answer. Delphi and Corinth are also major Greek locations in the game, but neither is Kassandra's birthplace.