Give me the story behind it

''The Prince was the only descendant of the King and the young man was unmarried. It's rumored that he had a fiancee,'' King Rezeph shook his head, ''But the subjects have never seen her so one cannot know if it's true. Regardless, the Prince did not have an heir and the Duke was childless as well.'' 

Esme did not say anything anymore. 

''Are you talking about Visteria, Your Majesty?" Jeremiah asked. 

'Crash' 

Everyone's head snapped at Leo who ducked a crystal bowl down the dining table. 

''Leo, be careful,'' Esme carried him to her lap as she stroked his head, ''I don't want to see you getting yourself hurt,'' she glanced at the glass shards on the floor. 

''He has become naughtier,'' Rezeph laughed before he turned to look at Jeremiah, ''You were saying something?" 

''Yes, the kingdom you are talking about... is it Visteria?"