The War between 2 Kingdoms.

There is an older adventure series that has many structural similarities to One Piece: The Mysterious Cities of Gold.

In that series, two ancient super-civilizations — Mu (Hiva) and Atlantis — fought a massive war that eventually destroyed both of them.

A possible parallel interpretation in One Piece could be:

•	One of the ancient civilizations corresponds to the Ancient Kingdom.

•	The descendants of that civilization are the people carrying the Will of D..

•	The opposing side may be the ancestors of the World Government, possibly connected to Imu.

Below are the main similarities fans often point out between the two stories.

⸻

1. Two Ancient Super Civilizations

In Cities of Gold:

•	Mu (Hiva)

•	Atlantis

Both were technologically advanced and dominant in the ancient world.

In One Piece:

•	the Ancient Kingdom

•	the alliance of the 20 kingdoms that later formed the World Government.

Both stories center around a lost global conflict between powerful civilizations.

⸻

2. A Great War That Changed the World

In Cities of Gold:

•	Mu and Atlantis fought a massive war.

•	The war lasted so long that people eventually forgot the original reason for it.

•	The conflict escalated with increasingly powerful technologies.

In One Piece:

•	the war during the Void Century destroyed the Ancient Kingdom.

•	The history of this war was erased from the world.

Both stories revolve around a hidden or forgotten ancient war.

⸻

3. Extremely Powerful Ancient Technology

In Cities of Gold the most dangerous technology is:

•	Great Legacy

It is essentially a massive energy source capable of powering advanced machines or devastating weapons.

In One Piece the equivalent may be:

•	the Ancient Weapons

•	or the mysterious energy source known as Mother Flame.

Both worlds feature ancient technology so powerful that it threatens the entire world.

⸻

4. Survivors of the Ancient Civilization

In Cities of Gold:

•	some survivors remain, including the Olmecs.

•	these groups try to reclaim the lost ancient power.

In One Piece:

•	the Will of D appears to represent descendants or inheritors of the Ancient Kingdom’s ideology.

Both stories feature survivors or descendants carrying the legacy of the lost civilization.

⸻

5. Hidden Knowledge From the Past

In Cities of Gold:

•	knowledge from the ancient world was hidden inside the Cities of Gold.

In One Piece:

•	the truth about the Void Century is preserved in the Poneglyphs.

Both stories involve ancient messages left for future generations to uncover.

⸻

6. A Journey to Discover the Final Truth

In Cities of Gold:

•	the characters search for the legendary golden cities that contain ancient knowledge.

In One Piece:

•	the Road Poneglyphs lead to Laugh Tale, where the truth of the world is supposedly revealed.

Both narratives are structured as a global quest to uncover the lost truth of history.

⸻

7. Sun Symbolism

In Cities of Gold:

•	the protagonist Esteban is called the Child of the Sun.

In One Piece:

•	the myth of Nika represents liberation and freedom.

•	Monkey D. Luffy embodies this symbol.

The sun in both stories represents hope, freedom, and the return of a lost era.

⸻

What Could Still Happen in One Piece (if these parallels continue)

Based on these similarities, some fans speculate that the final parts of the story could include:

1. The full truth about the Void Century will be revealed.

2. The Ancient Kingdom may turn out to have been a civilization fighting for freedom rather than domination.

3. The World Government may be revealed as the victors of the ancient war who erased history.

4. The Ancient Weapons or a hidden energy source could play a role similar to the Great Legacy.

5. Laugh Tale might contain not just treasure, but the complete truth about the world’s past and possibly a mechanism capable of changing the world.

6. The final conflict could mirror the ancient war, but this time ending differently — breaking the old world order.