Which C.S. Lewis novel was published in 1933 as an allegorical pilgrimage?

The Pilgrim’s Regress was the C.S. Lewis novel published in 1933 as an allegorical pilgrimage.

Its full title is The Pilgrim’s Regress: An Allegorical Apology for Christianity, Reason and Romanticism. The book follows John, who leaves his home in search of the distant Island and encounters figures and places representing ideas, philosophies, and spiritual conditions.

Lewis wrote the novel after his conversion to Christianity, and it was his first published work of prose fiction. Its structure deliberately recalls John Bunyan’s The Pilgrim’s Progress, but Lewis used the journey to explore modern intellectual and religious questions.

The book was not an immediate commercial success, and Lewis later acknowledged that its symbolism could be difficult for readers who did not share his intellectual background. It is distinct from The Great Divorce, another allegorical work, which appeared in book form in 1945.