Horseman‪!‬

The Last Defender of Camelot by Roger Zelazny is a collection of some of his best short stories and novellas. "Horseman!" is a one of the short stories included in the 1980 edition.
"Horseman!" presents a gripping tale of a young man who becomes embroiled in a battle between ancient gods and modernity, exploring themes of destiny, power, and the struggle for identity.