As the prize that the entire series is named after, one could assume that there would be a great deal of information surrounding the fabled One Piece, especially considering how long One Piece has been running. However, the minds behind one of the longest-running manga series of all time appreciate the impact suspense and mystery has on the story, so have kept many aspects of the treasure close to the chest.
Over time and the many adventures of Monkey D. Luffy and the Strawhat Pirates, both the main characters and the audience have been able to piece together some aspects of what this great treasure really is, which has only increased the audiences desire to see Luffy finally obtain it. While it seems like the discovery of One Piece is still quite a ways off in the story, that doesn't mean fans can't endlessly speculate on what it is based on the information already given to them.
5 It Was The Cause Of The Great Age Of Pirates
The world of One Piece is almost entirely made up of pirates in search of glory and the equally vicious Marines who claim to be able to keep them in check. Even before Gol D. Roger turned himself in to the authorities and was executed, various pirate factions dominated the seas in search of fame and fortune. However, it was Roger's final words as he was executed, claiming to have amassed an enormous fortune that he hid in the Grand Line, which set off a new age in humanity known as the Great Age of Pirates.
Unfortunately for the Marines, who thought they could quash the growing numbers of pirates by killing the most notorious pirate of all time, this new age would bring about conflict on a scale that hadn't been seen in centuries. Many people who already knew about One Piece would go on to say that anyone who discovered the fabled treasure would spark a battle that would engulf the entire world, bringing a further sense of turmoil to an already chaotic period of time.
4 Located On The Grand Line
Aside from it being mentioned explicitly in the 4Kids opening for One Piece, Gol D. Roger himself confirmed that the One Piece was left on the Grand Line, a vast ocean current that spans the entire equator of the world. This current makes passage through the Grand Line incredibly dangerous and as such, comparatively few people have managed to navigate the Grand Line without dying in the process, which made it the perfect hiding place for a treasure like the One Piece.
Specifically, the One Piece is said to be located on the final island of the New World on the Grand Line, which was named by Roger himself after discovering it. After seeing some of the undisclosed treasure that makes up the sum total of the One Piece, learning of the true nature of the world, and the events that occurred during the Void Century, he burst into laughter. Considering the entire ordeal nothing more than a funny story, he named the island Laugh Tale.
3 It's All Of Gol D. Roger's Treasure
One of the first things the audience learns about One Piece is that it is most likely one of the most valuable treasures of all time, being the total accumulated wealth that Gol D. Roger was able to obtain over his life as the King of The Pirates. Considering just how powerful and notorious Roger was by the end of his life, it's safe to assume that anyone lucky enough to find his treasure would be set for life and could easily retire from a life of piracy.
Since Luffy is the main protagonist of the series, it seems very likely that he will at least get his hands on it at some point, if not be the one to find it in the first place, but it seems unlikely that he would give up a life of piracy so easily. Unlike many other pirates in One Piece, Luffy is after the glory and adventure of being King of The Pirates and doesn't have much of an attachment to material things, aside from his straw hat.
2 At Least Some Of It Once Belonged To Joy Boy
One of the few pieces of information that wasn't given about One Piece during the opening moments of the anime was the fact that, at one point, it actually belonged to someone else. Long before Roger claimed it for himself, at least some of the One Piece belonged to a man named Joy Boy during what is known as the Void Century. This was a period of 100 years, beginning 900 years before the series began and ending 800 years before this point, where history wasn't recorded and is said to be vastly important to knowing the true nature of the world. What this means exactly hasn't been stated yet, but it is clear that something to do with the One Piece is key to understanding what happened in the world during this 100-year gap in history.
1 Few People Know What It Is
While most people know that the One Piece is the accumulation of all of Gol D. Roger's wealth during his time as the King of The Pirates, as well as whatever parts of it once belonged to Joy Boy, few people know what it actually is. The clear exception to this are the Roger Pirates who made the journey to the Grand Line and Laugh Tale, though even those few who did make the trip are willing to talk about it.
Ussop once tried to ask Silvers Rayleigh, one of the few Roger Pirates who was both with Gol D. Roger when he discovered Joy Boy's treasure and who is still alive by the events of One Piece, but Luffy refused to let him answer the question, as he felt it would go against the whole point of becoming the Pirate King to know what the treasure was before actually finding it. Whitebeard, Roger's biggest rival, also seemed to know what it was, as he stated that anyone who found the One Piece would spark a global conflict and would shake the world to its core.
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