Enid Mary Blyton was a popular English children's writer. She was one of the most successful children's storytellers of the twentieth century. She is noted for numerous series of books based on recurring characters and designed for different age groups. Her books have enjoyed popular success in many parts of the world, and have sold over 400 million copies. By one measure, Blyton is the sixth most popular author worldwide: over 3400 translations of her books are available in 2007 according to UNESCO's Index Translationum;she is behind Lenin and almost equal to Shake One of her most widely known characters is Noddy, intended for beginning readers.