William Butler Yeats (1865-1939) was an Irish poet and is considered one of the greatest writers from the twentieth century. He played an important role in the Celtic Twilight, a revival of Irish literature focused on Gaelic heritage and Irish nationalism. Yeats was fascinated by Irish legends, including many Irish heroes in his works and focusing his poetry on Irish folklore. Alongside his poetry he is famous for writing short stories and plays. Yeats set up the Abbey Theatre in 1899, which held Irish and Celtic performances. In recognition of his important work he received a Nobel Prize in 1923. Judith John (glossary) is a writer and editor specializing in literature and history. She has worked as an editor on major educational projects, including English A: Literature for the Pearson International Baccalaureate series. Judith’s major research interests include Romantic and Gothic literature, and Renaissance drama.