Emer is the subject of William Butler Yeats' play "The Only Jealousy of Emer". This play is one of his five famous Cú Chulainn pieces, and is written with heavy stylistic influences from the Japanese Noh theatre. The story is taken, with some alterations, from Lady Gregory's saga-story of the same name in her collection "Cuchulain of Muirthemne" (1902). "Jealousy" premiered in Amsterdam in 1922, under the direction of Albert van Dalsum with masks created by the sculptor Hildo Krop. It did not play on the Irish stage until May 1926, when it was staged by the Dublin Drama League at the Abbey Theatre.