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Atlantis as seen from its entrance

Atlantis was an ancient Isu city whose remains were situated at the bottom of the Aegean Sea, beneath the island of Thera, Greece.

Prior to its final destruction, the city was ruled by the Poseidon and was considered one of the Sister Realms along with the underworld realms of Elysium and Hades and appeared to defer to the authority of Mount Olympos.


The Greek philosopher Pythagoras compared Atlantis' function to that of a library, containing all of the knowledge of the Isu; including their physiology, scientific advancements, historical knowledge, culture, and beliefs.


During the Isu Era, the city was originally ruled by Atlas but he was supplanted by his power-hungry father, the Trident King Poseidon, who gave Atlas and his nine brothers the surbordinate position of Archon to manage the city's affairs.[1]

Poseidon, as the Dikastes Basileus, the Grand Adjudicator, adopted a cycle system for Atlantis wherein the city would be destroyed and rebuilt every seven years if he judged it to be imperfect. He also eventually outlawed the use of experimentation on the city's human residents.[2]

According to one Atlantean myth, a matter which led Poseidon's loathed brother Zeus to visit the city and reprimand Poseidon in person enraged the Trident King so much that he destroyed the very cycle in which the meeting had occured.[3]

Around the year 429 BCE, the Gateway to the Lost City, which connected Atlantis to the surface world, was visited by the Spartan misthios Kassandra. There, she discovered her biological father, Pythagoras, along with the Staff of Hermes, which had kept him alive for a very long time.[4] Together, they used the Atlantis artifacts to seal the entrance to the city.[5]

A simulated version of the city was later visited by Kassandra to help her master the Staff.[2]




  1. Assassin's Creed: OdysseyBios of the Gods
  2. 2.0 2.1 Assassin's Creed: OdysseyWelcome Home
  3. Assassin's Creed: OdysseyThe Fate of Atlantis: Judgment of Atlantis / Isu codex: A Tale of Brothers
  4. Assassin's Creed: OdysseyA Family's Legacy
  5. Assassin's Creed: OdysseyThe Gates of Atlantis

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