The Emerald Throne

 In this opening novel of "Kingdoms of the Jewel Mountain" series. 
Prince George and his friend Peter start out on a simple trip to confirm George's status as heir to the Emerald throne, but they soon find themselves the target of many plots for control of the six kingdoms and the power of the ancients.
During their travels, they will encounter an enigmatic witch, get advice from an eccentric wizard, escape from a rival king, make a pack with werewolves, and fall in love.