created by Marion Zimmer Bradley
The Darkover books are a series of novels and short stories set primarily on the fictional lost colony planet Cottman IV, also known as Darkover. Because they take place on another planet, and canon includes space ships and interstellar travel, these novels are sometimes called science fiction; but because they also involve societies whose main transport is the horse and who rule by telepathic aristocracy, it is also fair to call the series fantasy.
The works in this series were written out of time-order and span several hundred years, and so have many protagonists. Bradley explored several topics that were quasi-taboo at the time, including homosexuality (male and female) and polyamory, and was influential on the role of feminism in science fiction fandom.