Valperga: or, the Life and Adventures of Castruccio, Prince of Lucca is an 1823 historical novel by the Romantic novelist Mary Shelley, set amongst the wars of the Guelphs and Ghibellines (the latter of which she spelt "Ghibeline"). Mary Shelley's original title is now the subtitle; Valperga was selected by her father, William Godwin, who edited the work for publication between 1821 and February 1823. His edits emphasised the female protagonist and shortened the novel. Valperga is a historical novel which relates the adventures of the early fourteenth-century despot Castruccio Castracani, a real historical figure who became the lord of Lucca and conquered Florence.