Baltasar Hidalgo de Cisneros
The news of the fall of the Junta of Seville reached Buenos Aires in May 1810. With both the king of Spain and the Junta removed of power, many people thought that Cisneros had no legitimacy to govern, starting the May Revolution. Cisneros tried to calm down the population, to no avail. He called the commanders of the local armies and requested their support, but they denied it. Cisneros was ultimately forced to allow an open cabildo, which would discuss what to do. Although those meetings were usually composed of the wealthiest population, the army and a group of rioters plotted to prevent the entry of many wealthy people and allow common people instead.
May Conspiracy
In March 1849, Mikhail Bakunin, a Russian Pan Slavic revolutionary, visited Prague and suggested to organize an armed uprising in Prague and several German-speaking cities as a response to post-1848 political reaction. The date of the uprising was set on May 12, 1849, but due to amateurish organization police took the organizers into custody on the night of May 9 to May 10 1849.