The Revolt of the Brotherhoods (Catalan: Revolta de les Germanies, Spanish: Rebelión de las Germanías) was a revolt by artisan guilds (Germanies) against the government of King Charles I in the Kingdom of Valencia, part of the Crown of Aragon. It took place from 1519–1523, with most of the fighting occurring during 1521. The Valencian revolt inspired a related revolt in the island of Majorca, also part of Aragon, which lasted from 1521–1523.
The revolt was an anti-monarchist, anti-feudal autonomist movement inspired by the Italian republics. It also bore a strong anti-Islamic aspect, as rebels rioted against Valencia's peasant Muslim population (also called mudéjars, to contrast with crypto-Muslims or Moriscos in the Crown of Castile, where Islam was outlawed) and imposed forced conversions to Christianity. The agermanats are comparable to the comuneros of neighboring Castile, who fought a similar revolt against Charles from 1520–1522. Both rebellions were partially inspired by the departure for Germany of Charles, the new King of both Castile and Aragon (in a personal union that would form the basis for the Kingdom of Spain), to take the throne as Holy Roman Emperor and leaving behind a somewhat disreputable Royal Council and regent.
Valencia was dealing with a variety of problems in the early 16th century. In King Ferdinand II's later years as ruler, the government slowly decayed and became more corrupt. The economy in Aragon was not as vibrant as in Andalusia, as it was more based on agriculture and less on the lucrative maritime trade. Valencia's economy was dominated by two somewhat static factions: the landed nobles, who controlled agriculture and the countryside, and the Germanies (guilds), which controlled light manufacturing, crafts, and the cities. Outbreaks of famine, flood, and plague impeded the economy still further.