Lord of Light 

Roger Zelazny’s science fantasy novel Lord of Light was published in 1967. It won the Hugo Award for Best Novel in 1968 and was nominated for a Nebula Award in the same year. The novel’s first two chapters, “Dawn” in April 1967 and “Death and the Executioner” in June 1967, were published as novelettes in the Magazine of Fantasy and Science Fiction.

Lord of Light, according to Zelazny, was written in such a way that it could be read as either science fiction or fantasy.