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Legacy

Shelley died leaving many of his works unfinished, unpublished or published in expurgated versions with multiple errors. Since the 1980s, a number of projects have aimed at establishing reliable editions of his manuscripts and works. Among the most notable of these are:

Shelley's long-lost "Poetical Essay on the Existing State of Things" (1811) was rediscovered in 2006 and subsequently made available online by the Bodleian Library in Oxford.

Charles E. Robinson has argued that Shelley's contribution to Mary Shelley's novel Frankenstein was very significant and that Shelley should be considered her collaborator in writing the novel. Professor Charlotte Gordon and others have disputed this contention. Fiona Sampson has said: "In recent years Percy's corrections, visible in the Frankenstein notebooks held at the Bodleian Library in Oxford, have been seized on as evidence that he must have at least co-authored the novel. In fact, when I examined the notebooks myself, I realised that Percy did rather less than any line editor working in publishing today."

The Keats–Shelley Memorial Association, founded in 1903, supports the Keats–Shelley House in Rome which is a museum and library dedicated to the Romantic writers with a strong connection with Italy. The association is also responsible for maintaining the grave of Percy Bysshe Shelley in the non-Catholic Cemetery at Testaccio. The association publishes the scholarly Keats–Shelley Review. It also runs the annual Keats–Shelley and Young Romantics Writing Prizes and the Keats–Shelley Fellowship.