Knight's ransom.
(Book)

"Uneasy lies the head that wears a crown. A brutal war of succession has plunged the court of Kingfountain into a power struggle between a charitable king who took the crown unlawfully and his ambitious rival, Devon Argentine. The balance of power between the two men hinges on the fate of a young boy ensnared in this courtly intrigue. A boy befittingly nicknamed Ransom. When the Argentine family finally rules, Ransom must make his own way in the world. Opportunities open and shut before him as he journeys along the path to knighthood, blind to a shadowy conspiracy of jealousy and revenge. Ransom interrupts an abduction plot targeting the Queen of Ceredigion and earns a position in service to her son, the firstborn of the new Argentine dynasty. But conflict and treachery threaten the family, and Ransom must also come to understand and hone his burgeoning powers."--Publisher.