A beautiful woman of the Aos Sí ("people of the barrows") who takes a human lover. Lovers of the Leannán Sídhe are said to live brief, though highly inspired, lives. The name comes from the Gaelic words for a sweetheart, lover, or concubine and the term for a tumulus or burial mound.
The Leannán Sídhe is generally depicted as a beautiful muse who offers inspiration to an artist in exchange for their love and devotion; however, this frequently results in madness for the artist, as well as premature death.
The Leanhaun Shee (fairy mistress) seeks the love of mortals. If they refuse, she must be their slave; if they consent, they are hers, and can only escape by finding another to take their place. The fairy lives on their life, and they waste away. Death is no escape from her. She is the Gaelic muse, for she gives inspiration to those she persecutes. The Gaelic poets die young, for she is restless, and will not let them remain long on earth—this malignant phantom.