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 Aragon's population of mudéjars 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.