THE PONEGLYPHS
Dispersed by the world they exist some ancient stone runes, written in an extinct language, that contain data of the history that have been lost with the passage of time, these runes are called Poneglyphs. The content of those writings reveals the history of each country, the dark history of the world and even great secrets, like the location of the Ancient Weapons.
NICO ROBIN AND THE TRUE HISTORY
Nico Robin is the only person in the world able to decode the ancestral language in which is written the Poneglyphs. Robin comes from an family of archaeologists and it is the last one of its descendants. The objective of Nico Robin is to find true history, the history "that cannot be told", hidden by some reason to the passage of time. For it she has to follow the Rio Poneglyph, "Rio" from the Spanish word (river) in representation to the way from rune to rune (as the current of a river), since it is said that each Poneglyph told the way to the following one, thus until you reach the one that contains the "true history". The reasons for Robin's search unknown.
ARABASTA: THE ANCIENT WEAPON PLUTON
In the Real Crypt, under the palace of Arabasta, was the Poneglyph that told the location of Pluton, the ancestral weapon. Robin arrived to this rune with the help from Crocodile, when she was a member of the Baroque Works. Robin, said him that in the Poneglyph only was written up the history of the real family of Arabasta, but she was lying and keeping the data from Pluton. To date, she hasn’t revealed yet what was really written in that Poneglyph.
SKYPIEA: THE ANCIENT WEAPON POSEIDON
With the defeat of Enel, the people of Shandia rescue the Gold Bell. This bell and the writings of its base were the treasure of the ancestors of the town of Shandia, they died protecting them. Robin decipher its content, from all the writing she reveal the following:
"We are the recorders of history. Existing in harmony whit the sound of the great bell"
"The ancient weapon with the power so strong that is was named after a God… Poseidon"
And the most surprising, next to that Poneglyph there was a hand added writing in the same language:
"We came here, found the text and followed its guidance" - Gol D. Roger
That writing not only demonstrated that the Pirate King has been in Skypiea, it also demonstrates that he knew the ancient language and that he was cruising the Rio
Poneglyph. Nico Robin reach to a conclusion, if the way of Roger is the Rio Poneglyph, the way to true history is the way to Raftel.