"The Execution of Doge Marino Faliero", a 19th-century painting by Eugène Delacroix.
In history, an illegal & overt seizure of a state, which was famously known as coup d'etat, was not always successful. In 1354, there's a famous abortive coup launched by an 81-year-old Doge of Venice, Marino Faliero, against the city's ruling aristocrats. There were several main reasons behind this. First, Faliero's second wife, Aluica, was rumored to be insulted by Michele Steno, a member of an aristocratic family. And second, Faliero wished to transform Venice from oligarchic government to absolute, dynastic rule.
Faliero, with 2 other public figures, Calendario & Isarello, soon planned the coup and started to recruit 20 trusted men who would assist them in the overthrow of the government. However, rumors of unrest quickly began to spread throughout the city and the Venetian people, fearing the turmoil would swell up, reported the rumors to the authorities. One of the most powerful governmental bodies in Venice, the Council of Ten, soon convened to discuss the rumors.
They became concerned about the Doge's role in the plot and later ordered the immediate arrest of Calendario and Isarello, who, upon questioning, implicated the Doge. After a series of trials, Faliero pleaded guilty to all charges and was beheaded and his body mutilated. Other ringleaders were later hanged on display in St. Mark's Square.