Just by the way Frederick was dressed, it looks like he was not royalty. He was not a Prince. It looked like he was just knight. His armour had no cape nor did his armour have a coat of arms. His helmet did not have a plume. The hilt of his sword seemed too plain for royalty. Maybe it wasn’t an accident he was turned into gold. Maybe Midas turned him into gold because he was not good enough for his daughter. That’s how she became the nag with the bad attitude.