Main Page | See live article | Alphabetical index The One Piece is a fictional treasure from the popular anime and manga One Piece. The One Piece is a legendary treasure said to be of unimaginable value. It's said that it was hidden somewhere deep in the Grand Line by its previous owner; the Pirate King Gold Roger. Nobody seems to know what it really is or what it looks like. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.