Arthur catelio-fox is an official king of the kingdom of Roos. He ascended the throne after his father's death due to a plague attack, at the age of eleven (in that year it was called the plague of eternal death, because it made infected people instantly lose consciousness for months. But then it disappeared nine months after its first spread). Being young, after marrying the sixteen-year-old princess Selena, (now queen consort) who was the daughter of the king of the kingdom of Sheer.