What subject did C.S. Lewis teach at Oxford University before becoming a professor at Cambridge?

Before becoming a professor at Cambridge, C.S. Lewis taught English literature at Oxford University.

Lewis held academic posts at Oxford, including a fellowship and teaching position at Magdalen College. His Oxford career lasted for decades, and he became known not only as a scholar but also as a writer of fiction, apologetics, and literary criticism. His academic specialty was English language and literature, especially medieval and Renaissance texts.

In 1954, Lewis left Oxford for Cambridge University, where he became the first holder of the newly established chair of Medieval and Renaissance English. He was a fellow of Magdalene College, Cambridge, until his death in 1963.

A common mix-up is to identify Lewis primarily with theology because of books such as Mere Christianity. He wrote extensively about Christianity, but his university appointment was in English literature, and his scholarly work included major studies of literary history and criticism.