The greater number of the stories I have used, and persons I have spoken of, are in Lady Gregory’s _Gods and Fighting Men_ and _Cuchulain of Muirthemne_. If my small Dublin audience for poetical drama grows to any size, whether now or at some future time, I shall owe it to these two books, masterpieces of prose, which can but make the old stories as familiar to Irishmen at any rate as are the stories of Arthur and his Knights to all readers of books. I cannot believe that it is from friendship that I weigh these books with Malory, and feel no discontent at the tally, or that it is the wish to make the substantial origin of my own art familiar, that would make me give them before all other books to young men and girls in Ireland. I wrote for the most part before they were written, but all, or all but all, is there. I took the Aengus and Edain of _The Shadowy Waters_ from poor translations of the various Aengus stories, which, new translated by Lady Gregory, make up so much of what is most beautiful in both her books. They had, however, so completely become a part of my own thought that in 1897, when I was still working on an early version of _The Shadowy Waters_, I saw one night with my bodily eyes, as it seemed, two beautiful persons, who would, I believe, have answered to their names. The plot of the play itself has, however, no definite old story for its foundation, but was woven to a very great extent out of certain visionary experiences. The foundations of _Deirdre_ and of _On Baile’s Strand_ are stories called respectively the ‘Fate of the Sons of Usnach’ and ‘The Son of Aoife’ in _Cuchulain of Muirthemne_. _The King’s Threshold_ is, however, founded upon a middle-Irish story of the demands of the poets at the Court of King Guaire of Gort, but I have twisted it about and revised its moral that the poet might have the best of it. It owes something to a play on the same subject by my old friend Edwin Ellis, who heard the story from me and wrote of it long ago. APPENDIX IV. THE DATES AND PLACES OF PERFORMANCE OF PLAYS. _The King’s Threshold_ was first played October 7th, 1903, in the Molesworth Hall, Dublin, by the Irish National Theatre Society, and with the following cast: Seanchan FRANK FAY King Guaire P. KELLY Lord High Chamberlain SEUMUS O’SULLIVAN Soldier WILLIAM CONROY Monk S. SHERIDAN-NEILL Mayor WILLIAM FAY A Cripple PATRICK COLUM A Court Lady HONOR LAVELLE Another Court Lady DORA MELVILLE A Princess SARA ALGOOD Another Princess DORA GUNNING Fedelm MAIRE NI SHIUBHLAIGH A Servant P. MACSHIUBHLAIGH Another Servant P. JOSEPHS A Pupil G. ROBERTS Another Pupil CARTIA MACCORMAC