C.S. Lewis published his 1926 long poem about a fictional world under the title Dymer.
Dymer is a narrative poem written in a style influenced by epic and romantic literature. It tells the story of a mysterious figure named Dymer and the strange world associated with him. Lewis published it under the name Clive Hamilton, the same pen name used for his earlier poetry collection Spirits in Bondage.
The poem belongs to Lewis’s pre-Christian literary period. Its imagery, mythic atmosphere, and interest in moral and spiritual themes anticipate concerns that later appeared in his fiction, although Dymer is considerably less familiar to general readers than The Chronicles of Narnia or the Space Trilogy.
Dymer is sometimes confused with Lewis’s later invented worlds because the title itself sounds like a place or character from fantasy literature. It is specifically a long poem, not a Narnia novel or a volume of theological prose.