The Grand Duchy of Jeuno, or more commonly just Jeuno, is a booming city-state in the World of Vana'diel from Final Fantasy XI. Built upon Heaven's Bridge, the city is a structure that allows passage between the Quon and Mindartia continents.
Jeuno's national policy is one of neutral mercantilism, and is governed by a set of relatively loose regulations. This encourages a constant flow of traders of all races, from Hume shopkeepers to Goblin merchants, to visit this colorful, cosmopolitan town. Jeuno is also the only country to retain the ancient skills required to construct airships, which provides a rapid method of travel between nations.
At the time of the beastmen invasion several decades ago, this small nation took leadership of the countries of Vana'diel. Jeuno forged those countries into the Alliance of Altana, and succeeded in repelling the onslaught.