What was the name of C.S. Lewis’s lifelong friend and older brother?

C.S. Lewis’s lifelong friend and older brother was Warren Lewis.

Warren Hamilton Lewis, usually called Warnie, was born in 1895, three years before his younger brother. The brothers shared childhood interests, military experiences, and a home in Oxford after C.S. Lewis established his academic career.

Warren served in the British Army during the First World War and later became a historian. He also belonged to the Inklings, the informal literary group that included C.S. Lewis and J.R.R. Tolkien. His journals provide valuable evidence about the brothers’ daily life and social world.

Warren is sometimes overlooked because C.S. Lewis’s public reputation is much larger. He was not merely a relative mentioned in biographies: he was an important companion, household member, and trusted witness throughout Lewis’s adult life.