Camelot #1: A World Called Camelot by Arthur H. Landis

This story takes place in the distant future, where humanity had long ago gained firm purchase to the stars. The Galactic Foundation is a far flung Terran body benignly keeping tabs on planets with primitive cultures. For the past two hundred years, observers from the Foundation had been avidly tracking the progress of Fregis, the second planet in the Fomalhaut star system. In the Galactic listings, this world is called Camelot. And with good reason. Magic works on Camelot. In this feudalistic society, knighthood is in full flower and chivalry holds sway. And for the Terrans, this makes for fascinating study. (