She is a governing Heroic Spirit summoned by the Great Grail to oversee the Holy Grail War. Her true name is Joan of Arc. At first, she was thought to have been called forth to run the greatest Holy Grail War without delay, but she presently takes notice of the conspiracy behind the War.

Ruler / Joan of Arc The katakana read more accurately as Jeanne d'Arc, but it is rendered in the translation as Joan of Arc due to the Anglicisation presented in the background.