May Revolution
The mutiny of Aranjuez in 1808 led King Charles IV of Spain to abdicate in favor of his son, Ferdinand VII. Charles IV requested that Napoleon restore him to the throne; instead, Napoleon crowned his own brother, Joseph Bonaparte, as the new Spanish King. These events are known as the Abdications of Bayonne. Joseph's coronation was met with severe resistance in Spain, which started the Peninsular War, and the Supreme Central Junta took power in the name of the absent king. This also led to Spain switching allegiances from France to Britain. France eventually invaded Sevilla, and a Council of Regency based in Cadiz replaced the disbanded Supreme Central Junta.
May Revolution
Juan José Castelli was the main speaker for the revolutionaries. He based his speech on two key ideas: the government's lapsed legitimacy—he stated that the Supreme Central Junta was dissolved and had no rights to designate a Regency—and the principle of retroversion of sovereignty. He spoke after Riega, and replied that the American people should assume control of their government until Ferdinand VII could return to the throne.