In Assassin's Creed Odyssey, Kephallonia is the protagonist's family home and the game's starting region.
Odyssey begins on Kephallonia, an island in the Ionian Sea. The player controls Kassandra or Alexios, depending on the selected character, and starts as a mercenary living there. The opening region introduces the protagonist's relationships, early work, and connection to a family mystery that drives the wider story across the Greek world.
The game is set during the Peloponnesian War in the fifth century BCE. It presents a large open-world version of ancient Greece, including Athens, Sparta, the Peloponnese, the Aegean islands, and other regions. Kephallonia's rugged coastline and small settlements provide a deliberately local beginning before the story expands into political, military, and mythological adventures.
Crete, Euboea, and Rhodes are all Greek locations that can be visited or referenced in the broader setting, but they are not the opening home region. The island's name may also appear as Cephalonia or Kefalonia in modern transliteration. “Kephallonia” is the form used by the game and its English reference material.