Sapphire von Lotaringen is the courageous and kind-hearted protagonist of 'Ribon no Kishi' (Princess Knight). Raised as a boy by her royal parents to secure the throne, she skillfully balances her dual identity as both prince and princess. Sapphire is skilled in swordsmanship and possesses a strong sense of justice. Throughout the series, she fights to protect her kingdom against those who threaten it and struggles with her own identity, serving as a groundbreaking and influential heroine in shoujo manga history.