Void Century

The Void Century is a century-long gap in recorded and archaeological history, the study of which is forbidden by the World Government. The events of this period are so important and relevant that by learning them, one is said to become aware of the "true history" of the world. 800 years ago, at the end of the Void Century, the World Government was born and took political control of the entire world, uniting all countries and forming the Council of Kings. For the World Government, the events of the Void Century were better left unknown as information linked to it is considered far too dangerous. When the research of the Poneglyphs was outlawed, hundreds of scholars across the world were killed. Since then, a very strict ban on any research at all related to the Void Century has been put in place. At the end of the Void Century, the 20 kingdoms came together to defeat the Ancient Kingdom and then founded what is now known as the World Government. The founding members pledged the equality between their kingdoms in front of the Empty Throne, with each kingdom leaving a weapon of their own next to the throne in order to symbolize its protection. The exact process of how it was founded and how they covered up the 100-year gap remains unknown.

Poneglyphs are mysterious stone blocks with history inscribed onto them, and these blocks are scattered all over the Grand Line. The Government has forbidden anyone to research or study these blocks. They have been said to be unbreakable by Professor Clover. The Ancient Weapons are three weapons of mass destruction that are powerful enough to bring ruin to the entire world. They're known as Pluton, an ancient battleship capable of massive destruction, Poseidon, a Mermaid with the ability to communicate with and control Sea Kings, and Uranus, the properties of which remain unknown. The Ancient Weapons are the argument used by the World Government to forbid the research of the missing years. These events occurred 800 to 900 years before the current storyline. It was hinted at during the Skypiea Arc; the dates were seen in Robin's flashback. This period became known as the Void Century because there is nothing left to acknowledge anything that happened in it, aside from the poneglyphs which are written in a language that only two living people know how to read. However, it causes a problem with the known histories of the world as nothing ties up because of that missing period. Though many seem to know there is a gap in the historical record, virtually everyone is unaware that filling in this gap is possible. For example, Nefertari Cobra, after being told by Nico Robin about this missing period, was completely shocked that a way to "tie the threads of history together" existed. The fact that filling the gap is possible was proven when "Dark King" Silvers Rayleigh revealed that the Roger Pirates discovered the true history. The true history of the world apparently contains secrets so dangerous that those who are aware of them, including outlaws, are highly reluctant to talk about them. The Roger Pirates and Edward Newgate did not reveal to the public what lies hidden at Laugh Tale and Kozuki Oden did not reveal to his followers the true history because he considered it a burden. Silvers Rayleigh offered to tell the true history to Nico Robin, but warned her that the way she was then, she would not be able to do anything about it. The most important event during the Void Century has to be the Great War. It ended around 722 with the fall of Shandora. In Enel's cover story, there is an ancient city on the moon with another bunch of identical Automata. There is a painting on the wall that shows a Skypiean with Automata following him on the left while a Shandorian and Birkan work on the right. After resources on the moon ran out, the three races departed for the "Blue Star". One of the three races, the Shandorians, ended up on the isle of Jaya where they built the city of Shandora one thousand years ago. The great city of Shandora collapsed during this war, the Shandorians defended the city against "those who seek the stone". The city collapsed, but the Shandia, who are the descendants of the Shandorians, kept on defending the city for over eight hundred years afterwards. All three races are noted to have wings on their backs (though each has a slightly different shape) and may have even once been the same race. The connection between the sky island of Skypiea and the Void Century is the poneglyph left there for the Shandia and the Shandorians before them to protect. The Great Kingdom was a great and powerful kingdom that was destroyed by the Twenty Kingdoms, who would later evolve into the World Government. The kingdom was so powerful that its existence posed a great threat to the world, and is the reason why studying the poneglyphs is outlawed. In the Great Kingdom's illustration, a few moon-craters are shown, indicating a possible connection of it with the kingdom. The Great Kingdom had a name, which is yet to be revealed. However, Clover stated that its name was of tremendous importance and held the key of understanding the Void Century.