How many books have been published in the children's book series, 'The Chronicles of Narnia'?

The Chronicles of Narnia is a series of seven high fantasy novels by author C. S. Lewis.

The Chronicles of Narnia's seven books have been in continuous publication since 1956, selling over 100 million copies in 47 languages and with editions in Braille.

The first five books were originally published in the United Kingdom by Geoffrey Bles. The first edition of The Lion, the Witch and the Wardrobe was released in London on 16 October 1950. Although three more books, Prince Caspian, The Voyage of the Dawn Treader and The Horse and His Boy, were already complete, they were not released immediately at that time, but appeared (along with The Silver Chair) one at a time in each of the subsequent years (1951–1954). The last two books (The Magician's Nephew and The Last Battle) were published in the United Kingdom originally by The Bodley Head in 1955 and 1956.