I Just Became the Prince-And You Want a Divorce

Daeron secretly married Catelyn but left to prove himself. He returns as Prince of Dragon Isle in rags, only to be humiliated. His dragon core is fed to a dog, which transforms into a young dragon. At the victory banquet where they planned to hand him over, Gareth drops to one knee and calls him "Your Highness." The man they scorned is their ruler.