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I Am Legend is a 1954 post-apocalyptic horror novel by American writer Richard Matheson that was influential in the modern development of zombie and vampire literature and in popularizing the concept of a worldwide apocalypse due to disease. The novel was a success and was adapted into the films The Last Man on Earth (1964), The Omega Man (1971), and I Am Legend (2007). It was also an inspiration behind Night of the Living Dead (1968).