Jeanne d'Arc, also known as Ruler, is a prominent character in Fate/Grand Order, a popular mobile game and anime series. She is based on the historical figure Joan of Arc, a French heroine and saint. In the series, Jeanne is a heroic spirit summoned to participate in the Holy Grail War. She is depicted as a strong and noble warrior, embodying the virtues of purity, justice, and leadership. Her role involves guiding and protecting the protagonists on their quest to restore the world's balance.