What was the title of C.S. Lewis’s 1933 autobiographical allegory about a spiritual journey?

C.S. Lewis’s 1933 autobiographical allegory about a spiritual journey was The Pilgrim’s Regress.

The full title is The Pilgrim’s Regress: An Allegorical Apology for Christianity, Reason and Romanticism. Its central character, John, travels through a landscape filled with symbolic figures and obstacles. The narrative reflects Lewis’s intellectual and spiritual development, including his movement from atheism toward Christianity.

Lewis modeled the work partly on John Bunyan’s The Pilgrim’s Progress, but he set his story in a modern intellectual landscape. The allegory engages questions about desire, reason, ideology, and religious belief rather than simply retelling a biblical journey.

The book appeared in 1933, the year after Lewis’s conversion to Christianity. Lewis later acknowledged that its symbolism was not always easy for readers to interpret. His later autobiographical book Surprised by Joy is nonfictional and should not be confused with this earlier allegorical novel.