Arthur Drake Brighton is the eldest son of a noble English family. Calm, reserved, and charming, he is an accomplished equestrian who owns a horse named Alexandra and wins competitions organized by equestrian clubs. He shares a long-standing friendship with Sarah Frances Russell that evolves into a mutual romantic relationship, and he consistently supports Sarah and her family through hardships, including the loss of their home and financial struggles. Arthur cares for Lynn Russell as a younger sibling figure, providing guidance and stability as she adapts to high society life, and he teaches her horseback riding along with his younger brother Edward. His calm presence and steadfast devotion to Sarah are central to his character.