Mr. and Mrs. Castle

Japanese: キャッスル夫妻 - きゃっするふさい

…The fast-paced quick waltz is called the Viennese waltz, invented by the German Paul Krebs and included in dance competitions. In 1910, the American couple Irene Castle and Vernon C. Castle introduced the first dance to jazz accompaniment, danced in a natural style with the feet moving from the heels, the same as normal walking, which they named the foxtrot. Until then, dancers had moved from the toes, but the Castle Walk, which the couple introduced, became the basis of modern ballroom dancing. …

From [Jazz Dance]

...A dance style developed by African Americans based on African dance. Dances that move the body mainly through hip movements to jazz rhythms have been danced by white people since around 1910, and the foxtrot was invented by the Castles. In the 1920s, the Charleston, with its two-beat rhythm, became popular.

*Some of the terminology that refers to "Mr. and Mrs. Castle" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また，テンポの速いクイック･ワルツを〈ビニーズ･ワルツViennese waltz〉といい，ドイツのパウル･クレブスが創案し，ダンス競技の種目に加えられている。　1910年にはアメリカのアイリーンIrene CastleとバーノンVernon C.のキャッスル夫妻が，ジャズを伴奏にして，はじめてヒール(踵)から脚を運ぶ普通の歩き方と同じ自然なスタイルで踊るダンスを〈フォックストロット〉と名づけて発表した。それまでの踊りは，トウ(つま先)から脚を運んでいたが，キャッスル夫妻の始めたこの〈キャッスル･ウォーク〉は，近代社交ダンスの基礎となった。…