The Last Battle (7th book in The Chronicles of Narnia series) was awarded the Carnegie Medal, which is one of the highest markings in Childrens Literature.
He was friends with J.R.R. Tolkein (writer of the Lord of The Rings trilogy) which they meet up at a writers club to discuss story ideas. J.R.R. Tolkein criticized Lewis's second Narnia book, The Lion, The Witch, and the Wardrobe.