What pseudonym did C.S. Lewis use for his 1933 allegorical novel The Pilgrim's Regress?

C.S. Lewis used the pseudonym Clive Hamilton for his 1933 allegorical novel The Pilgrim's Regress. The book was his first published work of prose fiction and presents a symbolic journey through philosophical and religious ideas.

Lewis had already published poetry under the name Clive Hamilton, including Spirits in Bondage and Dymer. Using a pseudonym helped separate these works from his academic identity and allowed him to publish in a different literary mode.

The title refers to John Bunyan's The Pilgrim's Progress, but Lewis's book is set in a modern intellectual landscape. Its protagonist, John, travels through encounters representing competing beliefs and temptations. Lewis later revised the book and added a new preface, acknowledging that some of its symbolism and arguments could be difficult for readers unfamiliar with the debates of his time.