Clive Staples Lewis (29 November 1898 – 22 November 1963), commonly referred to as C. S. Lewis and known to his friends and family as Jack, was an Irish-born British novelist, academic, medievalist, literary critic, essayist, lay theologian and Christian apologist. He is also known for his fiction, especially The Screwtape Letters, The Chronicles of Narnia and The Space Trilogy.