Hello.
So this was supposed to be added to this theory but the thread is closed now so I can't really post it there.
Anyways, my theory is about the conflict between the 20 ancient kingdoms (that now form the World Governement) and the D. Kingdom.
So several centuries ago, the World was composed of only seas and a few islands (some were bigger than others). The Grand Line didn't exist, along with East Blue, North Blue, South Blue and West Blue, because nothing was there to separate these seas.
I think that the WG created Red Line. Why ? I really don't know, but I think that the answer may come from space (like, literraly) : Maybe their ancestors come from the Moon, and are really attached to the land and seem to hate the sea ?
How ? No clue.
However, Marijoie is said to be their holy land, so it seems that there is a religious (or at least spiritual) meaning behind all this.
So with the creation of Red Line (and Reverse Mountain), everything started to change. The climat on the Grand Line, for example. Calm Belt also mysteriously appeared.
Thing is, the WG built Red Line on top of the Fishman island. Why ? Because as I said earlier, they hated the sea, and so the sea creatures too.
I would like to note that the Sea represents liberty in the One Piece world. With that being said, you can parallel it to the real life, with people who want to dominate liberty.
We called the 20 kingdoms the "Earth Nation", opposed to the D. Kingdom that was considered to be the "Sea Nation".
Now I also think that the fishmen, the giants, the dwarves, the minkmen, the skypians (well, the people that live in the sky in general) and the long-legs / long-arms tribes were allied to the D. Kingdom.
Together, they declared war upon the 20 Ancient Kingdoms.
I think that, as there is a poneglyphe on Skypiea, and on the Fishman island too, there will be one in Erbaf and in the home-land of the Long-legs/arms tribes. Plus, dwarves are said to be linked to the Void Century somehow.
The war lasted for 100 years exactly (which is comparable to the 100 years war that occured between France and England before), and the battles were really frightening, so terrible that it was erased from history (for more details just read the theory that I linked before).
This leads us directly to the Ancient Weapons, that I believe to have been created by the D. Kingdom and their allies.
- Poseidon was created by the fishmen, since they had a mermaid capable of communicating with the Sea Monsters.
- Pluton was built by the Giants (I think that it was said that a special wood came from Erbaf)
- I think that Uranus was built by some sky-island people.
Now there are devil fruits too but I really don't know wether they were created by the WG or by the D.
They tried to destroy Red Line but failed, and lost the battle.
All the creatures who had helped the D. Kingdom (Fishmen, dwarves…) were turned into slaves.
http://i.imgur.com/3DLoogS.jpg
(sorry, french picture)
Being a pirate - even if you don't kill people or anything - was then considered as a crime, because traveling on the sea was forbidden. Remember that scene when a Celestial Dragon blew Sabo up ?
Then, the WG started qualifing the D. as Demons, ennemies of gods. Why ? Because they refused to believe in the Holy Land of Marijoie.
http://i.imgur.com/FFVCMso.png
(Here, Rosinante says that were he comes from, so Marijoie, since his parents were Celestial Dragons, D. are considered to be devils, or at least monsters, plus he says that they are the natural ennemies of God. I'm not making things up here).
Good thing is, the D. had the brilliant idea to write it all down on their Poneglyphes. Their wish would be that their dreams would be inherited in the future. Gold Roger got that out and told the world that the One Piece exists so that they discover the truth, the truth that the WG is trying to hide (not from me, once again, I'm referring to the theory that I linked at the beginning of the theory).
I think that the Celestial Dragons are the sons of the biggest soldiers / commanders of the WG.
- Their astronaut masks may make us think that they come from space (I know that they don't wan't to breath the same air as the normal humans, but it could be deeper than that).
The Gorosei would be the sons of the 5 first kings or be the 5 major kings themselves (which would mean that they have been kept alive all this time thanks to Bonney's fruit, which would make sense because Sakazuki and the WG seem to need her).
http://i.imgur.com/1cwg7ck.jpg
http://i.imgur.com/S22Eo4x.jpg
I think that at the end of the manga, we will have the final confrontation between these two dreams (the WG's dream and the D. dream).
Luffy may not follow the Poneglyphes, since it could destroy half of the world, but instead try to unite the entire world.
Thank you for reading, feel free to developp (or destroy) this theory, and have a nice day. :happy: