What is Celtic Noh "At the Hawk's Well (The Hawk Princess)"? Celtic Noh "The Hawk Princess" is the unprecedented show which has never been seen before, high artistic quality and spirit of "Yugen" of Noh melting together with mysterious Celtic choir. “The Hawk Princess” is the only Noh play with the original work written by non-Japanese. It was written by Irish poet, William Butler Yeats. “The Hawk Princess” is a rare work in which Japanese and Celtic spirits are melting together, and also shows a commonality between them. Yeats was inspired by Noh culture strongly, and recognized the shared ideology between them. He wrote “At the Hawk’s Well” inspired by Noh and published in 1917. After that, “At the Hawk’s Well” was imported to Japan and revised as Japanese Noh play “The Hawk Princess” which was premired in 1967. 2017 is 100th Anniversary of publishing of “At the Hawk’s Well”, 50th Anniversary of “The Hawk Princess”, and 60th Anniversary of establishing diplomatic relations between Ireland and Japan. In this timing, this show will indicate same spirit, between Ireland and Japan, which has a rich imagination and connected to Other World.