Dragonlord Series by Joanne Bertin, James Frankel

Dragonlord Linden Rathan, last-born of a race of immortal weredragons, has spent six hundred years alone, searching for his soultwin while his fellow Dragonlords watch over humanity's Five Kingdoms. When the Queen of Cassori dies mysteriously, Linden and the other Dragonlords are called upon to prevent civil war as two human claimants vie for the regency... moreDragonlord Linden Rathan, last-born of a race of immortal weredragons, has spent six hundred years alone, searching for his soultwin while his fellow Dragonlords watch over humanity's Five Kingdoms. When the Queen of Cassori dies mysteriously, Linden and the other Dragonlords are called upon to prevent civil war as two human claimants vie for the regency. As the battle for Cassori rule escalates, Linden becomes the target of the Fellowship, a secret society of true-humans who could actually destroy his immortal life. Then he meets a beautiful young ship captain named Maurynna who may be the only one who can help Linden bring Cassori back from the brink of chaos. less

Once every thousand years the phoenix of Jehanglan burns to death in a magical release. For millennia the emperors of Jehanglan have tried to harness the awesome power of the phoenix's rebirth. One has finally succeeded, using black magic and the enslavement of a dragon. Far away at the Crown of the World, Dragon-lord Linden and his new wife, Maurynna, are trying to live the life of happy newlyweds. But all is not well... moreOnce every thousand years the phoenix of Jehanglan burns to death in a magical release. For millennia the emperors of Jehanglan have tried to harness the awesome power of the phoenix's rebirth. One has finally succeeded, using black magic and the enslavement of a dragon. Far away at the Crown of the World, Dragon-lord Linden and his new wife, Maurynna, are trying to live the life of happy newlyweds. But all is not well. Since her first Change into dragon-form, Maurynna has been unable to duplicate it. And as her inability to Change drives her into a dark abyss of depression, Linden begins to doubt the love he was once so sure of... At this time of personal crisis, these two must journey to Jehanglan and marshall all of their diplomatic and martial skill to penetrate the treachery of the empire and set free the phoenix. But to do so they must face the dragon--the dragon who just might be a Dragonlord gone mad.... less