So first I will try to give extra sources about who Joyoboyo are, whom in this theory, BonneySHP11st & Ashura_KingFisher stated it could be related to Joy Boy
! Sri Mapanji Jayabaya or Jayabhaya, (Javanese spelled: Ratu Joyoboyo) was Javanese King of the Kediri in East Java from 1135 to 1157 CE.
King Jayabaya is creditied with reunification of the Kediri kingdom following a split due to the death of his predecessor Airlangga. King Jayabaya was known for his just and prosperous rule, and reputed to have been an incarnation of the Hindu deity Vishnu. King Jayabaya epitomized the archetypal Ratu Adil: the just king reborn in the dark age of suffering "Jaman Edan" to restore the Jaman Raharja: social justice, order, and harmony in the world, as Javanese believed in a cyclical history of alternating prosperity epochs of (Jaman Raharja) followed an era of suffering (Jaman edan), to cycle back to an era of prosperity (Jaman Raharja).
Jabaya termed his kingdom Widarba, meaning a thousand cities in Pamenang, modern Kediri Regency. Intertwined between fact and myth are records that his father Gendrayana, claimed to be a descendant of Pandavas as being son of Yudayana: the son of Parikshit: the son of Abhimanyu: the son of Arjuna from the family Pandavas. From Jayaba's queen consort Dewi Sara wife were born all daughters Dewi Jayaamijaya, Pramesti Dewi, Dewi Pramuni and Dewi Sasanti. Queen Dewi Jayaamijaya was married to King consort Astradarma Pramesti Yawastina king and birthed King of Anglingdarma: Malawapati.[1]
Jayabaya abdicated in old age and sought a life of meditation as a Hindu recluse, informing a moksha he was the incarnation of Wishnu, in the village of Menang, in Pagu sub-district of Kediri Regency, until the modern era still considered a sacred pilgrimage site, according to Kejawen belief system. Sukarno and Suharto both meditated at length in Menang to attain an air of kingly legitimacy, supernatural abilities, Jayabaya's blessings and/or powers.
Prophecies[edit]
! Ratu Jayabaya is most famous for his oracles or prophesies attributed to him, namely the Serat Jayabaya Musarar, Serat Pranitiwakya, and some debatable others. The manggala (prologue) of the famous Kakawin Bhāratayuddha names King Joyoboyo as the patron of the two poets, Mpu Sedah and Mpu Panuluh who were the authors of the work. Joyoboyo is also attributed as author of the Prelambang Joyoboyo, a prophetic book that played an important role in the Japanese occupation.
According to a selectively abridged set of stanzas within a Joyoboyo prophesy (all are extremely long epic poems):
"The Javanese would be ruled by whites for 3 centuries and by yellow dwarfs for the life span of a maize plant prior to the return of the Ratu Adil: whose name must contain at least one syllable of the Javanese Noto Negoro."
! When Japan occupied the Netherlands East Indies, in the first weeks of 1942, many Indonesians danced in the streets, welcoming the Japanese army as the fulfillment of the prophecy ascribed to Joyoboyo, who foretold the day when white men would one day establish their rule on Java and oppress the people for many years – but they would be driven out by the arrival of yellow men from the north. These yellow dwarves, Joyoboyo had predicted, would remain for one crop cycle, and after that Java would be freed from foreign domination. To most of the Javanese, Japan was a liberator: the prophecy had been fulfilled.[3]
The Japanese freed Indonesian nationalists from Dutch prisons and hired them as civil servants and administrators. In the waning days of 1944, however, it was clear that Japan could not win the war. The Japanese officially granted Indonesia its independence on 9 August 1945, and the commander of Japan's Southeast Asian forces appointed future President Sukarno as chairman of the preparatory committee for Indonesian independence. As one account of Indonesian history puts it, "With the minor exception that three crops had been harvested, Jayabaya's prophecy had been realized."
Many believe that the time for the arrival of a new Ratu Adil is near (as the prophecies put it, "when iron wagons could drive without horses and ships could sail through the sky"), and that he will come to rescue and reunite Indonesia after an acute crisis, ushering in the dawn of a new golden age.
source: http://en.wikipedia.org/wiki/Jayabaya
History clearly pointed out that Japan and Java are related in some aspects, so why not about Oda Eiichiro making One Piece with a little, yeah, Java-based story.
Umm, this is some of the prophecies. At the end of it, the prophecy says about 2 things: golden era and King of Justice, which i believe the (in this case, not related to the prophecy) golden era are when WG begin to fall, king of justice i believe would be The Pirate King.
! Below are the signs of the chaotic era
1. The earth quakes seven times a day
2. The soil is broken everywhere
3. People are sighing for pain, many of them are in illness
4. Disasters are everywhere
5. Only few can survive, most of them perish
The chaotic era starts when:
1. Carts can go without horses
2. The island of Java is cuffed with iron
3. Ships navigate in the sky
4. Rivers lost their lakes
5. Markets lost their echoes
6. People face the upside down era
7. Horses eat chili sauce
8. Women wear male outfits
The chaotic era looks like the era of hedonism, the era of earthly pleasures, but in fact it is the era of world destruction.
1. That is why many fathers neglect their children
2. Many children disobey their parents
3. Siblings are hurting one another
4. Women lost their decency and men lost their nobleness
5. Many men are without wives
6. Many women are faithful to their husbands
7. Many mothers sell their children
8. Many women sell their bodies
9. Many couples exchange their spouses
10. Rain often drops not in its season
11. There are many old unmarried women
12. Many widows bear children
13. Many newly born babies look for their fathers
14. Many women propose a marriage to men
15. Many men humiliate their own dignity
16. Many neglected children
17. Widows are cheap to buy
18. It only takes a cent to get two widows
19. It only takes two cents to get two virgins
20. Even a crippled widower can get nine women
It is a chaotic era
1. Women ride horses
2. Men just do nothing
3. Righteous people know nothing to do
4. Unjust people are happy
5. Good people are not welcome
6. The bad ones are get promoted
7. Many bad people are considered as the good ones
8. The wrong ones are considered as the right ones
9. Simple people are put in iron cuffs
10. Noble people are put behind bars
11. Mean and bad people get the fortune while the honest ones get the misfortune
12. Merchants cheat their trade
13. More and more people like gambling
14. People forget their children and spouses, and people forget their neighbors and friends
15. Money and hard work are only to gamble
16. When the gambling cards are opened, people laugh
17. But they come home with no money in their pockets
18. They don't even care when their spouses or children cry
However hard it can be, but don't loose your stand in this uncertain era; because, the era will be gone and it will be replaced by the era of the King of Justice, the golden era. So, be tough, be able to endure the hardship, be strong, don't let yourself drowned in the chaotic era. Wait for the golden era of the King of Justice.
http://en.wikisource.org/wiki/The_Prophecy_of_Joyo_Boyo
And some i-believe-it's-related thoughts of mine are:
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It's made from Batik the one Enel wears. Batik is originally from Java. You could see here:
http://en.wikipedia.org/wiki/Batik
I came to conclusion that Jaya Island is basically Java Island. Thought that from the shape of the island it's very different, but from the information i gave above it's somehow related. And so about Joy Boy and Joyoboyo (from the inherited will/prophecy perspective, the two believed the world will change for a good sake). I lack of information about Verith, winged people, and moon soldiers.
Damn for my bad english. I was just trying to give you additional information. Please correct me if i'm wrong.