The "Void Century" refers to a mysterious period in the history of the world of One Piece that lasted for 100 years, approximately 800 to 900 years before the current storyline. This era is largely undocumented, and its events are shrouded in secrecy, making it a significant point of intrigue within the series. The World Government actively suppresses information about this time, leading to speculation and theories among characters and fans alike. During the Void Century, the ancient civilization known as Ohara thrived, and it is believed that they possessed knowledge about this lost history. The Poneglyphs, stone tablets inscribed with ancient writing, are key to uncovering the truths of this era. Characters like Nico Robin seek to learn more about the Void Century to understand the true history of their world.