Four Emperors

The Yonkou (四皇, Four Emperors), are the four (currently only three) great pirates who rule the second half of the Grand Line (known as the "New World").

History
The first of the Yonkou to be introduced was Shanks who visited Luffy's hometown ten years ago. Although, it was unknown that the Yonkou existed at this point of time. It is reasonable to assume they did as this was around the time the Shichibukai organization was being formed. The second was Whitebeard, the only man to tie in a fight with Roger. Whitebeard was also later announced as the strongest pirate in the world upon Roger's death. Some of the Shichibukai were rivals to the Yonkou in the past; Shanks was a rival to Mihawk, Kaidou to Gecko Moria, and Whitebeard to Crocodile.

Shanks and Whitebeard are both familiar to the old days of piracy, before Roger's death 22 years ago. It is currently unknown if the other two Yonkou are from the old days of piracy.

All of the Yonkou seem to have strong fleets, including ships and elite crewmen. All Yonkou have traveled to the New World at some point in their past, where they are currently locked in stalemate, unable to progress any further into the Grand Line. This is a product of the combined efforts of both the Marines and Shichibukai, as well as the presence of the other Yonkou in the Grand Line.

Until recently, the World Government has been fine with the world powers remaining as they are. With the Yonkou stuck in a deadlock situation, this allowed the world to remain stable. However, with the absence of Crocodile, defeated at the hands of the Straw Hat Pirates, the World Government was alarmed that two of the Yonkou, Shanks and Whitebeard, arranged to meet each other. Later, with Enies Lobby in ruins, the Marines saw another defeat in the New World when a blockade failed to prevent the two meeting.

Fearing the two crews might form an alliance, the World Government lay in wait to see what happened. Shanks believes the days of Whitebeard as the top pirate are coming to an end, warning him of the era to come. With Blackbeard aka Marshall D. Teach now making his move to the top, the pair are seen clashing weapons.

Whitebeard War Saga
In an attempt to rescue his 2nd Division Commander, Portgas D. Ace, Whitebeard attacked Marineford. Kaidou attempted to stop Whitebeard; however, he was intercepted by Shanks. During this battle against the Marines, Whitebeard revealed how ill he had become over the last two decades, and that he continues to suffer more critical damage from his adversaries in his weakened state. Remaining at Marineford alone to finish the conflict with the Marines, Whitebeard was ambushed and ultimately perished at the hands of the Blackbeard Pirates, leaving only three Yonkou. Shortly afterwards, Shanks arrived at Marineford with his crew in an attempt to stop the war.

According to Eustass Kid, due to Whitebeard's death, the Yonkou has now dropped down to three, and the balance of the Three Great Powers have crumbled, which led to chaos around the world. Indeed, islands that were once under Whitebeard's protection, such as Fishman Island and Foodvalten, became under attack by pirates.

Strength
They are one of the 3 great powers, the other being the Shichibukai and Marines. They live quite literally as though they are emperors, doing mostly as they please. For the World Government, they are the greatest pirate threats in the world. It is only the combined efforts of the Marines and the Shichibukai that keeps their power in check. Interestingly, their existence as a disunified group appear to be even less pronounced than that of the Shichibukai, having only been introduced right after the introduction of Garp

The Yonkou themselves are not united together as one group like the Shichibukai and follow their own individual paths. However, the possibility that two or more of the Yonkou could form an alliance is a great threat to the World Government. For that reason, the World Government attempts unsuccessfully to prevent a meeting between Red-Haired Shanks and Whitebeard at one point in the series. The World Government feared that the two Yonkou may unite together and create a stronger threat. A war between two of the 4 Yonkou is considered an epic crisis. Shanks' interception of Kaidou's advancement on Whitebeard had taken the Marines by shock and awe.

They can inspire others to become pirates. Examples of this include Shanks inspiring Luffy and Whitebeard who had inspired Ace. On top of this, the influence these pirates have over others is far greater then any other noted group. With one declaration, the kidnappings on Fishman Island stopped after the island was announced to be under Whitebeard's control.

Trivia

 * So far none of the Yonkou have had their bounties revealed.

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