|Relatives||King Cassius III (nephew)|
|Current Location||Saint Haven Castle|
|Voiced by||Hideki Ogihara (Japanese)|
Duke Stuart is one of four advisors of King Cassius III of Saint Haven, handling affairs between the noblemen, the commoners and the royalty. He possesses a sense of distrust towards the other advisors of the king, particularly General Douglas who oversees the royal army of Saint Haven, and is overly protective of the young king.