The legend of the lost city of Atlantis has captivated imaginations for millennia, morphing from a philosophical allegory into a sprawling symbol of forgotten technology, sunken empires, and ultimate hubris. When Eiichiro Oda began crafting One Piece, he wove together a tapestry of real-world history, mythology, and speculative fiction that naturally invites comparison to this enduring myth. Few fan theories ignite as much passionate debate as those connecting Atlantis to the mysterious Void Century, the Ancient Kingdom, and the very core of the Grand Line’s deepest secrets. This exploration delves into the most compelling fan theories that ask: did Oda hide the spirit of Atlantis beneath the waves of his world, and if so, what does that mean for the story’s endgame?

The Myth of Atlantis: From Plato to Pop Culture

Before tracing the connections to One Piece, it’s essential to understand the source material. Atlantis first appears in Plato’s dialogues Timaeus and Critias, written around 360 BCE. In Plato's account, Atlantis was a naval power located beyond the Pillars of Hercules (the Strait of Gibraltar) that attempted to invade Europe and Asia. It was described as a larger-than-life island continent with concentric rings of water and land, home to a sophisticated, technologically blessed civilization. The Atlanteans eventually grew greedy, morally corrupt, and hubristic, prompting the gods to submerge the entire island in a single day and night of catastrophic earthquakes and floods.

Over centuries, that simple tale transformed into a cultural archetype. The notion of a sunken continent populated by an advanced race reappeared in folklore, occultism, and modern media, from Ignatius Donnelly’s pseudo-scientific Atlantis: The Antediluvian World to Disney’s animated film and countless anime. The myth now serves as a shorthand for lost knowledge, ancient superweapons, and a cataclysmic fall from grace—themes that resonate powerfully with One Piece’s hidden history. Fans easily recognize these motifs in the Poneglyphs, the Ancient Weapons, and the deliberate erasure of an entire century of global events.

One Piece’s Mysterious Ancient History

The central enigma of One Piece is the Void Century, a 100-year gap in recorded history that occurred roughly 800 to 900 years before the current timeline. The World Government has outlawed the study of Poneglyphs and any research that might shed light on this period, branding those who pursue the truth as heretics and dangerous criminals. This censorship alone signals that something world-shattering lies buried. The Ohara Incident, where the Marines demolished an entire island of scholars, proves how far the Government will go to protect the secret.

The Void Century is inextricably tied to a lost civilization: the Ancient Kingdom. While its name and exact nature remain a mystery, its great enemy was the alliance of 20 kingdoms that eventually formed the World Government. After the Ancient Kingdom’s fall, the victors wrote history, literally erasing the kingdom’s existence and scattering its legacy across the globe in the form of indestructible Poneglyphs. The parallels with the Atlantis myth—a powerful, enlightened civilization destroyed by a coalition, its knowledge suppressed—are too striking for fans to ignore.

Fan Theories Linking Atlantis to the One Piece World

The core fan theory posits that Oda modeled the Ancient Kingdom directly on the Atlantis myth, possibly even naming it Atlantis in an older tongue, or placing its remains at the bottom of the sea. There are multiple branches of this theory, each supported by different in-world clues, narrative themes, and meta-textual references.

The Ancient Kingdom as the One Piece Atlantis

The most widespread theory is straightforward: the Ancient Kingdom is Atlantis. The parallels run deep. Plato’s Atlantis was an island continent that ruled over a vast maritime empire. The Ancient Kingdom of One Piece was an immense and highly advanced civilization that, according to Professor Clover’s final deductions during the Ohara flashback, was far larger and more powerful than any present-day nation. Its ideals posed an existential threat to the 20 allied monarchs, precipitating a war of annihilation. When the kingdom fell, the victors attempted to sink its memory—quite literally. If the lands of the Ancient Kingdom were submerged, it would mirror the fate of Atlantis, leaving only scattered remains like the ruins above Fish-Man Island or the mysterious mountains of Wano’s sea floor.

Some fans further speculate that the Great Kingdom might have been called "Atlandia" or a similar variation, with the name distorted over time. In this reading, the "Will of D." could carry the original name of the Atlantis-like kingdom, making all D. carriers descendants of the lost continent. The letters on the Poneglyphs, written in the same script as the "Rio Poneglyph," are a form of ancient language that no current nation uses, reminiscent of how Atlantean lore often includes a forgotten tongue.

Pluton, Poseidon, and the Technology of the Lost City

Plato’s Atlantis was known for its orichalcum, a legendary metal, and its incredible engineering. One Piece counters with three Ancient Weapons—Pluton, Poseidon, and Uranus—each named after deities of the sea and sky, each capable of world-altering destruction. The namesake connections to Greek mythology and the sea are impossible to overlook.

  • Pluton is a colossal battleship, reportedly able to destroy entire islands with a single shot. Its design blueprints were hidden in Water 7 and passed down by shipwrights who feared awakening it. The weapon’s description, a vessel of unparalleled destructive power, mirrors the naval supremacy of Plato’s Atlantis, which commanded a massive fleet capable of threatening the entire Mediterranean. Some fans theorize that Pluton was the flagship of the Ancient Kingdom’s navy, a relic from a time when the “Atlanteans” ruled the seas.
  • Poseidon is not an inanimate weapon but a living mermaid princess born once every few centuries with the ability to communicate with and command the Sea Kings—the gargantuan sea monsters that roam the Calm Belts and deep ocean. In mythology, Poseidon was the god of the sea, earthquakes, and horses, and was also the patron deity of Atlantis, having built the city’s magnificent temple to his son Atlas. The Mermaid Princess Shirahoshi embodies this power, her voice capable of summoning Sea Kings to wreak havoc or protect. The connection suggests that the original Poseidon might have been a guardian of the Atlantis-like kingdom, a living weapon used during the Great War.
  • Uranus remains a mystery, but its name—god of the sky—suggests a third form of cataclysmic power, perhaps related to the sky islands or the ancient automaton that attacked the Straw Hats in the moon-centric Enel cover story. Some fans link Uranus to the winged “Skypieans” and the ancient Shandora civilization, hypothesizing an ancient sky-based Atlantis counterpart. Others point to the explosive destruction of the Lulusia Kingdom by a mysterious weapon in the Egghead arc, suggesting Uranus is a space-based weapon that aligns with the story of a civilization that mastered the heavens, echoing the Atlantean notion of advanced, planet-spanning power.

The fact that these three weapons bear divine names and once belonged to a bygone era feeds the Atlantis parallel. If the Ancient Kingdom wielded such armaments, it would explain why the World Government is terrified of their resurrection—just as the gods of myth feared the hubris of Atlantis.

Fish-Man Island and the Sunken World: A Direct Atlantis Allegory

Few locations in One Piece feel more deliberately Atlantean than Fish-Man Island. Situated 10,000 meters below the surface of the Grand Line within a massive air bubble sustained by the Sunlight Tree Eve, this underwater paradise is home to fish-men and merfolk—a persecuted minority whose history is one of slavery, discrimination, and longing for the surface. Queen Otohime’s dream of a world where fish-men can live under the sun mirrors the tragic fate of Atlantis, a kingdom lost beneath the waves.

The island’s architecture—coral palaces, glowing reefs, and fluid designs—evokes the majestic capital of Atlantis described by Plato. The Ryugu Palace, with its central tower and surrounding city, calls to mind the concentric rings of Poseidon’s temple. More importantly, the island’s deep connection to the Void Century via the Poneglyph hidden in the Sea Forest and the revelation that Joy Boy made a promise to the Fish-Man Island’s princess centuries ago ties directly to the legend. The unfulfilled promise, inscribed on a Poneglyph in the same ancient script, suggests that Fish-Man Island was a key player in the Ancient Kingdom’s saga. Some fans speculate that the entire island is a remnant of the larger Atlantis-like continent, sent to the depths during the Great War. The Noah, a colossal ship resting in the Sea Forest, might have been built to save the kingdom’s people from the impending flood—a direct parallel to biblical and Plato’s account of a great deluge.

Further supporting the Atlantis link is the island’s desire to relocate to the surface with the help of the Straw Hats. Luffy’s final act of destroying Fish-Man Island, as predicted by Madam Shyarly’s vision, could be interpreted not as an attack but as the toppling of the old world order—raising the island to the surface and fulfilling Joy Boy’s promise, bringing the sun to the descendants of the lost continent.

The Voice of All Things and Atlantean Echoes

One of the rarest abilities in One Piece is the "Voice of All Things," possessed by individuals like Roger, Luffy, and Momonosuke. This power allows them to hear the voices of inanimate objects, ancient stones, and Sea Kings. In the context of an Atlantis connection, this ability could be a genetic inheritance from the people of the Ancient Kingdom. Plato wrote that the Atlanteans were “children of the gods,” implying a divine or semi-divine lineage with advanced perception. If the D. clan are the remnants of that civilization, their ability to awaken this voice makes narrative sense: they are hearing the echoes of their own fallen ancestors, the Poneglyphs acting like records of their last gasp.

The Poneglyphs themselves are indestructible blocks of history, resistant to decay and even direct attacks. This immortality of information mimics the idea that Atlantean knowledge was too powerful to be lost, so it was encoded in stone and hidden. The Rio Poneglyph—the combined text of all Poneglyphs—tells the true history of the Void Century, likely including the name, ideals, and demise of the Ancient Kingdom. The World Government’s fear of this truth is akin to a global cover-up of Atlantis’s real legacy, perhaps revealing that the “gods” of the One Piece world were not divine but highly advanced, and the Celestial Dragons are usurpers who rewrote history.

Sea Kings and the Atlantean Connection

The Sea Kings of One Piece are colossal, serpentine creatures that dominate the depths. They are intelligent enough to communicate and can deliberately block passage through the Calm Belts. In myth, Poseidon tamed the sea monsters and was often depicted driving a chariot pulled by sea dragons. The Mermaid Princess’s command over these beasts is a direct inversion of that imagery. But consider the scale: Sea Kings are large enough to pull the massive ship Noah, just as sea monsters might carry the city of Atlantis in some retellings. The Sea Kings’ collective hive-mind, evident when they discuss the timing of the “two sovereigns” meeting during the Fish-Man Island arc, suggests they are ancient guardians waiting for the right moment to awaken. If the Ancient Kingdom—the Atlantis of this world—once coexisted harmoniously with these creatures, the Sea Kings might be preserving the will of that lost era.

The Great Cleansing and the Fall of Atlantis

Plato’s story ends with Atlantis sinking beneath the waves because the gods grew angry at its corruption. In One Piece, the World Government’s “Great Cleansing” during the Void Century was a systematic annihilation of the Ancient Kingdom and its allies. The weapon used to sink the continent might have been a combination of the Ancient Weapons or a tool that altered the very sea levels—a scenario foreshadowed by the dramatic shifts in the Grand Line’s geography and the existence of the Calm Belt, which acts like a scar on the world.

More recently, the destruction of Lulusia Kingdom by a massive, pillar-like force from the sky (revealed to be Uranus) demonstrates that entire islands can be erased with catastrophic ocean disruptions. This catastrophic event caused sea levels to rise across the globe by a meter, supporting the theory that a similar weapon was used during the Void Century to flood the Ancient Kingdom. The resulting global flood would have submerged the continent, leaving only those like the fish-men and merfolk able to survive in the depths, which explains their emergence as a distinct species at that time.

Evidence in the Manga and Anime

While Oda has never confirmed an explicit “Atlantis” name, he has seeded the series with concrete references that fans interpret as direct nods. In the SBS (Question and Answer) corner of volume 16, Oda revealed that the island of "Laugh Tale" was originally written as "Raftel," but the spelling was adjusted. Some fans speculate that an earlier draft might have used a name like "Atlantia." The island’s location, hidden by four elusive Road Poneglyphs, resembles the myth of the unfindable sunken city.

During the Skypiea Arc, the ancient city of Shandora on the sky island of Upper Yard bears pyramid-like structures and gold motifs reminiscent of Mesoamerican and possibly Atlantean iconography. The Shandians, winged descendants of the "Sky People," were wiped out by the World Government’s ancestors but preserved their history through Poneglyphs. The concept of a golden city in the sky, once part of a larger civilization, parallels the idea that Atlantis had sky-reaching towers and that some survivors might have fled upward.

In the Wano Arc, the submerged ruins of the Kozuki Clan’s original capital on the sea floor hinted at a deliberate submersion. The manner in which Wano’s borders were closed and its ancient sea-prism stone craftsmanship suggests a direct link to the Ancient Kingdom. Momonosuke’s ability to command Zunesha—a gigantic elephant that wanders the sea—echoes the Poseidon ability and the Voice of All Things. Zunesha’s punishment for a long-forgotten crime might be tied to the Great War, and the elephant’s size suggests a continent-carrying role, evoking the image of a vast landmass sinking beneath it.

The Poneglyph script itself is identical across all types, hinting at a unified ancient language. Nico Robin’s ability to read it puts her in the crosshairs of the Government, just as any Atlantean historian would be hunted for possessing forbidden knowledge. The Ohara episode, with its Tree of Knowledge holding books from around the world, is a conscious echo of the Library of Alexandria myth but also the fabled repositories of Atlantis. The Government’s Buster Call, wiping Ohara off the map, mirrors the absolute eradication of the Ancient Kingdom.

Cultural Parallels and Oda’s Inspirations

Eiichiro Oda is known for mining real-world history and mythology to build his universe. Characters like Enel are based on Eminem and the sky god; the Ancient Weapons draw from Greek myth; the Void Century resembles the Dark Ages after the fall of Rome. The Atlantis myth fits perfectly into this pattern. In an early interview, Oda mentioned being inspired by the movie Castle in the Sky, which features a floating island with advanced technology and a lost civilization. The themes of floating and sunken domains appear repeatedly in his work, suggesting a deliberate dualism: Skypiea represents the sky aspect of the lost world, while Fish-Man Island represents the underwater counterpart.

Additionally, the Japanese concept of "Mu," a fictional lost continent of the Pacific, often mingles with Atlantis in pop culture. Many Japanese manga, such as Nadia: The Secret of Blue Water and RahXephon, blend Atlantis with Mu. Oda’s own series One Piece features a world almost entirely covered by water, a single supercontinent (the Red Line), and a Grand Line full of strange islands—geography that suggests a post-cataclysmic reshaping. The reader might enjoy exploring external analyses of this Void Century on the One Piece Wiki, which details the canonical mysteries, or read more about Plato’s original Atlantis to compare.

The Future of Atlantis in One Piece’s Final Saga

As the series enters its final saga, the revelations on Egghead Island have already started pulling back the curtain on the Void Century. Dr. Vegapunk’s broadcast to the world hinted at a flood caused by an ancient weapon, and the introduction of the "Warrior of Liberation" archetype that Luffy embodies ties directly to the fall of the Ancient Kingdom. If the Atlantis parallel holds, the truth of the world will involve uncovering not just a forgotten city, but an entire drowned continent whose ideals threaten the very foundation of the World Government’s authority.

Luffy’s dream, the one he shares with Roger and which appears in a silhouette cutaway, is often theorized to be about throwing the biggest party or conquering the sea. However, an Atlantean interpretation might frame it as lifting the sunken kingdom back to the surface—uniting the world’s seas, breaking the Red Line, and freeing the fish-men, much like a modern-day Noah. The Noah ship itself is named for a vessel of salvation. If Luffy uses the Ancient Weapons not for destruction but to reverse the ancient flood, he could fulfill Joy Boy’s promise and restore the lost continent.

Mysteries still remain. Who built the Poneglyphs? Why are the Lunarian tribe, capable of creating fire and surviving any environment, almost extinct? Where is the Ancient Kingdom’s original homeland? All these questions could be answered with a revelation that the Void Century was the One Piece version of the fall of Atlantis. The final Road Poneglyph might point not just to a location, but to a time or a state of being beneath the waves, accessible only to those who can command the Sea Kings or hold the Voice of All Things.

Readers seeking deeper speculation can visit the Library of Ohara, a fan project that compiles translations, analyses, and theories on the Void Century and Poneglyphs. Another valuable resource is the article on Ancient Weapons, which outlines their mythological origins. For a broader cultural perspective on how Atlantis shaped modern storytelling, consult Britannica’s Atlantis entry.

Why the Atlantis Theory Endures

The beauty of the Atlantis fan theory is that it doesn’t rely on a single smoking gun; it thrives on the thematic fabric of the series itself. One Piece is fundamentally about inherited will, the crushing weight of hidden history, and the liberation of the oppressed. Atlantis represents the ultimate lost cause—an idealistic civilization that tried to upend the world order and was erased for it. The Straw Hats, as they sail toward Laugh Tale, are tracing the footsteps of that civilization, guided by Poneglyphs that are, in essence, the Atlantean chronicles.

Whether Oda ever explicitly names it Atlantis, the structural and mythological parallels are firmly entrenched. The sunken city is a silent, haunting presence throughout the story: in the ruins of Fish-Man Island, the hum of the Sea Kings, the indestructible history blocks, and the promise of a sun that never reaches the depths. Fan theories will continue to evolve, but one thing is certain—unraveling the mystery of the Void Century will feel very much like discovering a real Atlantis, submerged beneath layers of lies, waiting for the dawn of the world.