The Celtic Revival was a cultural movement in the late 19th and early 20th centuries that sought to promote and celebrate the heritage of the Celtic nations, including Ireland, Scotland, Wales, and Brittany. It emphasized traditional arts, literature, music, and folklore, aiming to revive interest in Celtic languages and customs. Key figures in the movement included writers like W.B. Yeats and Lady Gregory, who played significant roles in the establishment of the Abbey Theatre in Dublin. The revival also inspired artists and musicians to draw from Celtic themes, leading to a renewed appreciation for Celtic identity and creativity.