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Switzerland and the Shelleys

After this break-up of his domestic life, and by pressure on the part of his creditors, which led to the sale of his library, Byron left England, and never returned. (Despite his dying wishes, however, his body was returned for burial in England.) He journeyed through Belgium and continued up the Rhine river. In the summer of 1816 he settled at the Villa Diodati by Lake Geneva, Switzerland, with his personal physician, John William Polidori. There Byron befriended the poet Percy Bysshe Shelley and author Mary Godwin, Shelley’s future wife. He was also joined by Mary's stepsister, Claire Clairmont, with whom he'd had an affair in London, which subsequently resulted in the birth of their illegitimate child Allegra, who died at the age of 5 under the care of Byron later in life. Several times Byron went to see Germaine de Staël and her Coppet group, which turned out to be a valid intellectual and emotional support to Byron at the time.

Kept indoors at the Villa Diodati by the "incessant rain" of "that wet, ungenial summer" over three days in June, the five turned to reading fantastical stories, including Fantasmagoriana, and then devising their own tales. Mary Shelley produced what would become Frankenstein, or The Modern Prometheus, and Polidori produced The Vampyre, the progenitor of the Romantic vampire genre. The Vampyre was the inspiration for a fragmentary story of Byron's, " A Fragment ".

Byron's story fragment was published as a postscript to Mazeppa; he also wrote the third canto of Childe Harold.