To put you in context. In One Piece the Void Century was the time in where the bad guys became dominant.
onepiece.fandom.com
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. These events...
