Delian Cycle Series by Alan Burt Akers, Kenneth Bulmer

On the planet Kregen that circles Antares, the brightest star of the Constellation of the Scorpion, two forces contend for the world's destiny. One of them, the Savanti, called in a human pawn from far-away Earth.His name is Dray Prescot, and only the Savanti know his role.Dray Prescot confronted a fabulous world -- barbaric, unmapped, peopled with both human and non-human races. But there were always the Star Lords to watch and check the Savanti's plans... moreOn the planet Kregen that circles Antares, the brightest star of the Constellation of the Scorpion, two forces contend for the world's destiny. One of them, the Savanti, called in a human pawn from far-away Earth.His name is Dray Prescot, and only the Savanti know his role.Dray Prescot confronted a fabulous world -- barbaric, unmapped, peopled with both human and non-human races. But there were always the Star Lords to watch and check the Savanti's plans. And it soon turned out that Dray Prescot himself had to make a decision that would change him from a mere pawn to a bolder piece on the planetary chessboard...Book one of the 52 volume saga of Dray Prescot. less

Helpless as the phantom forces of the Savanti and the Star Lords clash, Dray Prescot is swept once more from Earth to fulfil another gruesome task beneath the twin suns of Kregan... moreHelpless as the phantom forces of the Savanti and the Star Lords clash, Dray Prescot is swept once more from Earth to fulfil another gruesome task beneath the twin suns of Kregan. Will he be sent to Zair, where the red-sun deity reigns or to Grodno, land of the green-sun god where the evil overlords of Magdag rule a nation of slaves? As Prescot waits in limbo for the outcome of the battle, his one hope is that the task will take him nearer to his Princess, the lovely Delia, from whom the Star Lords snatched him so long ago... less

Once again in the grip of the Star Lords of the Constellation Scorpio, Dray Prescot found himself torn from the battles of the Inner Sea for a mission in the air. For it was now his duty to carry his betrothed Delia by airboat to that far kingdom from whence she had come. But the route lay across the gaunt mountains and shadowy jungles of the Hostile Territories--and there Dray was to be plunged among stranger peoples and more fantastic challenges than even his Kregen princess had known.

The Pirates of KregenWhat does a man do when fate makes him the protector of the royal head of his enemies? If it is Dray Prescot, Earthman on Antares, he sets aside his quest to do his duty. His quest was to reach Vallia and his princess. His duty was to defend Vallia's ancient foe and place its rightful heir on its throne--sworn to attack Vallia... moreThe Pirates of KregenWhat does a man do when fate makes him the protector of the royal head of his enemies? If it is Dray Prescot, Earthman on Antares, he sets aside his quest to do his duty. His quest was to reach Vallia and his princess. His duty was to defend Vallia's ancient foe and place its rightful heir on its throne--sworn to attack Vallia.So when the third force, the pirate fleets known as the swordships came between the two contending demands, Dray saw that only by following his own personal star could the contradiction be resolved. less

Dray Prescot had fought long and hard through perilous lands to claim the hand of the heiress of the mighty Vallia. Yet, when finally he set foot in that long-sought empire, it was not as hero or noble... It was as an unknown, a mendicant, and finally as a condemned slave. For the combatant fates that had interfered continually with his quest on the planet of the twin suns of Antares had yet more tests for the man they had selected as their agent... moreDray Prescot had fought long and hard through perilous lands to claim the hand of the heiress of the mighty Vallia. Yet, when finally he set foot in that long-sought empire, it was not as hero or noble... It was as an unknown, a mendicant, and finally as a condemned slave. For the combatant fates that had interfered continually with his quest on the planet of the twin suns of Antares had yet more tests for the man they had selected as their agent. But for Dray there was only one goal -- already in sight -- and he would not be turned aside any longer no matter what dangers Vallian intrigues and quasi-human mysteries may have in store for him. This edition contains maps and a glossary. (75000 words) less