A conspiratorial movement in Lisbon and Coimbra in August 1848, inspired by the popular and students' uprising of Paris from 22 to 24 February 1848 (which led to the fall of King Louis Philippe I and the proclamation of the Second Republic). It was controlled by the government of the Duke of Saldanha (with detaining of some of the heads of the conspiracy, the remaining ones falling in clandestinity), with the name by which the conspiracy became known deriving from the term used by Saldanha to define the organization ("revolutionary hydra")