The year she published "The Modern Prometheus", known as Frankenstein was 1818. Mary was only 20 years-old. It is sometimes called the world's first science fiction novel. The ideas for both "Frankenstein" and Polidori's "The Vampyre" were from the famous poet, Lord Byron. The books "Frankenstein" and "The Vampyre" were both published on the same year. Once Mary Shelley published Frankenstein, her life became more interesting