Camelot in Orbit by Arthur H. Landis
DAW Books, 1978
Price I paid: 90¢
Fomalhaut II was an inexplicable enigma in the annals of the Galactic Watchers. A world of knights and ladies, of dungeons and dragons, it was truly medieval and therefore out of bounds for science-armed Terrans. Yet science seemed thwarted there for magic really worked and witchcraft baffled the secret watchers.
Camelot was their name for it, and Kyrie Fern was their Adjustor on its surface—a knight in truly shining armor, a champion of chivalry, and the only one who actually stood between the Arthurian natives and the alien being that menaced both their world and the advanced planets that swung unseen through their sky.
Once again Arthur H. Landis has worked the magic of combining the wonders of swords-and-sorcery with the science adventure of high space.