"Valkyrie", known as "Walkure" (ワルキューレ Warukyūre, the German word for "Valkyrie") in Japan, are an archetype of LIGHT Fairy female monsters used by Zigfried von Schroeder in Yu-Gi-Oh!. They debuted in the TCG in Shadows in Valhalla.
The concept of the "Valkyrie" cards is derived from the valkyries of Norse mythology. Like most of Zigfried's cards, the "Valkyrie" cards are named after characters from the opera Der Ring des Nibelungen. The names of the "Valkyrie" monsters, "Erste", "Zweite", and "Dritte" are the German words for "first", "second" and "third".