Frankenstein author Mary Shelley kept her dead husband’s heart and carried it with her for almost 30 years until she died in 1851. It was found in a desk drawer a year later, wrapped in a copy of one of his final poems. Source
Mary Shelley (1797-1851). Eloped with a married man (Percy Shelley) at 17; was ostracized by her father. Having just lost her first child and exiled from England, Mary Shelley decided she would, you know, invent an ENTIRE GENRE at the age of 18. Yes, she wrote Frankenstein, the first SF novel, at 18. After Percy Shelley's death, went back to England and supported herself and her son through her writing. Also wrote one of the first apocalyptic novels "The Last Man."