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. His armies threaten the fortress of Valperga, governed by Countess Euthanasia, the woman he loves. He forces her to choose between her feelings for him and political liberty.

Mary Wollstonecraft Shelley (1797-1851) was an English novelist, short story writer, dramatist, essayist, biographer, and travel writer, best known for her Gothic novel Frankenstein: or, The Modern Prometheus. She also edited and promoted the works of her husband, the Romantic poet and philosopher Percy Bysshe Shelley. Mary Shelley's works often argue that cooperation and sympathy, particularly as practiced by women in the family, were the ways to reform civil society. This view was a direct challenge to the individualistic Romantic ethos promoted by Percy Shelley and Enlightenment political theories.