The Levely (Kanji literally translated as "World Council") is a council formed by the World Government which consists of 50 of the world's leaders out of the over 170 nations affiliated with the World Government.
Every four years, kings or queens gather at Mary Geoise for a seven day conference to discuss matters that could affect the world.
As this is a meeting of leaders of nations, a full scale war could be initiated if one king simply insults another. An example is when Wapol purposely hit Nefertari Vivi as an act of revenge against her father, Cobra, after he scolded Wapol for his selfishness. Due to Vivi's kindness, she refrained from making a scene, and Wapol was simply angry and left. The possibility for conflict is heightened due to the extreme range of viewpoints among the kings.
With a gathering of so many world leaders in such a "sacred" place, there are naturally some rules and regulations put in place. One such rule is that everyone, whether they be the royalty, their companions or their escorts, are to be disarmed for the duration of the Levely.
All heads-of-states attending the Levely are expected to make a pledge before the Empty Throne, both as a sign of allegiance to the World Government, and to symbolically state they are supporting the current "peace".
Each meeting, one of the participants acts as chairman. The chairman is chosen in rotation among all participants. During the current meeting, the chairman is KingHam Burger from the Ballywood Kingdom.
Eight years ago, participants discussed Dragon and his actions, stating that within four to five years, he would become a major threat to the World Government. This caused a conflict between Nefertari Cobra and Wapol when Cobra scolded Wapol for not taking the threat seriously.
The queen of the Ryugu Kingdom, Otohime, had worked on gathering signatures from her subjects to petition the World Government to relocate Fish-Man Island to the surface as a sign of furthering the peaceful relationship between Fish-Man Island's nativeraces and the humans that comprise the majority of the surface population. Even after her assassination, Otohime's family had worked to continue and fulfill her objective for years and attended the current Levely to finally make their request.
Despite his disagreement with Sakazuki, AdmiralFujitora went to Mary Geoise and encountered his colleague Ryokugyu. While they ate, they talk about Fujitora's travels and Dr. Vegapunk's new creation that Fujitora believed would make the Shichibukai system obsolete, which he planned to bring up to the Levely participants. Later, Pell told Vivi that Fujitora was in a meeting with Nefertari Cobra and Riku Dold III.
200 years ago, Ryugu Kingdom joined the World Government, and its king was granted a place on the Levely.
16 years ago, Queen Otohime, in an effort to get fish-men and merfolk to grow closer to humans, made a proposal to relocate Ryugu Kingdom to the surface. She wanted to present this wish at the Levely that year, and asked her kingdom's citizens for signatures.
15 years ago, King Neptune stated that he would not be allowed to attend the next Levely due to the recent incident of Fisher Tiger raiding Mary Geoise and liberating slaves, which caused Fish-Man Island's standing to fall.
10 years ago, Otohime went to Mary Geoise and returned with an official letter from a World Noble, supporting her cause to relocate Ryugu Kingdom. She stated that the plan could be realistically put into action if enough signatures are collected by the next Levely.
8 years ago, a Levely was held, with the participants including Thalassa Lucas, Nefertari Cobra and Wapol. During the meeting, Lucas brought up the Revolutionary Dragon, labeling his ideologies "dangerous" and stating that he would become a great threat to the World Government in 4-5 years. Wapol disregarded this as not concerning his country, which prompted Cobra to scold him for his irresponsibility. After the meeting Wapol came across Cobra's daughter Vivi and purposefully hit her as Levely against Cobra. Vivi, however, simply apologized in order to avoid conflict between their countries.
Despite no longer ruling any land, the Vinsmoke Family, as the ruling family of the maritime Germa Kingdom, retain the status and the privileges of royalty, including the right to attend Levely. However, Vinsmoke Judge expects the family's activities will imminently lead the World Government to strip them of this right.