Prince Vivien and the Princess Placida

Once upon a time in a certain kingdom were king and queen. They had a little daughter called Placida. King and queen invited a fairy for a christening of their child. The fairy advised to them to adopt the orphan child called Vivien. The king's family lived happily. But few years later Vivien took a horse and leaved the kingdom. Nobody knew what happened with young prince... Where did he go? What happened next? Read the story till the end to know!