Kelvin of Rud Series by Piers Anthony, Robert E. Margroff

The Prophecy: A Roundear there Shall Surely be; Born to be Strong, Raised to be Free; Fighting Dragons in his Youth; Leading Armies, Nothing Loth; Ridding his Country of a Sore; Joining Two, then uniting Four; Until from Seven there be One; Only then will his Task be Done. When Kelvin was a child, his mother read to him from the Book of Prophecy and he asked what the poem meant. Now he was about to learn... moreThe Prophecy: A Roundear there Shall Surely be; Born to be Strong, Raised to be Free; Fighting Dragons in his Youth; Leading Armies, Nothing Loth; Ridding his Country of a Sore; Joining Two, then uniting Four; Until from Seven there be One; Only then will his Task be Done. When Kelvin was a child, his mother read to him from the Book of Prophecy and he asked what the poem meant. Now he was about to learn. The Kingdom of Rud languishes under the heel of a usurper; an evil sorcerer has taken the throne in the name of his wicked daughter. Even deep in the forest, away from all power, the people tremble and await the day of prophecy's fulfillment. It cannot come too soon: Charlain and her children are soon to lose their home to the tax collector. But Kelvin and Jon have other plans. they have found a dragon's territory, where scales of purest gold, shed by the dragon, lie free on the ground for anyone with courage, or innocence, to take. And the words of Mouvar the prophet echo across Rud. less

A sequel to "Dragon's Blood". In this story Kelvin is the Roundear of Prophecy, but all he wants is a bit of rest. There's not much chance of that however, as his father is imprisoned in a dungeon beyond Flaw, and his brother is entangled with a beautiful girl and a silver serpent.

As a young man, Kevin Knight Hackleberry proved to be the Roundear of Prophecy: he liberated his own Kingdom of Rud from the cruel usurper Zoanna, and then went on to defeat the evil king Rowforth.... But now Zoanna and Rowforth have joined forces to take revenge on Kelvin....through his unborn child. Kelvin's beloved Heln lies helpless in prison...while Kelvin is trapped in a distant Frame World, a captive of the dread Chimaera.

In the kingdom of Rud, Charles, Merlain, and their brother, Dragon Horace, are in the center of a plot against Kelvin as they seek to steal the treasure of the Orc Kingdom.

As soon as the vile witch Zady has grown herself a new body, Professor Devale plans to send her back into the frame to flush out Mourvar and the Opal - and kill everything that Kelvin Knight Huckleberry holds dear. Other work by the authors includes Dragon's Gold and Orc's Opal.