Royalty Theatre "The Chili Widow", an adaptation of his own that ran for over 300 nights. In 1899, the first production of the Incorporated Stage Society took place with the first performance of Shaw's "You Never Can Tell". In 1900–01 Mrs. Patrick Campbell hired the theatre and staged a succession of contemporary plays in which she starred, and in 1903–04 Hans Andresen and Max Behrend presented a successful season of German theatre. Also in 1904, the newly founded Irish National Theatre Society gave plays by W. B. Yeats and, in 1905, it presented an early performance of Synge's first play, "The Shadow
Mary Devenport O'Neill Colum, W. B. Yeats, Richard Irvine Best, Frank O'Connor, Francis Stuart and Iseult Gonne. She became particularly close to Yeats, who she confided in. Yeats' recorded their weekly consultations in his diary while O'Neill was writing "A vision" (1925). In his "Oxford anthology of English verse" from 1936, he included one of O'Neill's poems. In 1917, she contributed lyrics to her husband's play "The kingdom maker". She published her only book in 1929, "Prometheus and other poems". After this she occasionally contributed primarily modernist plays and poetry to "The Dublin Magazine", "The Irish Times" and "The Bell". O'Neill collaborated with