Read The Copper Crown Storyline:
SUMMARY:High Queen Aeron of Keltia proposes an alliance with Earth, precipitating a war with two hostile planetary systems, fought with magic as well as technology, in this blend of science fiction and fantasy. The sequel is The Throne of Scone: A Novel of the Keltiad (1986). The Silver Branch: A Novel of the Keltiad (NAL, 1988) is a prequel to both books. Kennealy's Tales of Arthur series is set in the same world, 1,500 years earlier.
Pages of The Copper Crown :