Siabhra (plural siabhraí) is a Munster dialect term closely related to the Aos Sí or people of the mounds. While often translated simply as "
fairies," the term carries connotations of wandering spirits or spectral beings rather than just inhabitants of a specific otherworld realm. In literary analysis, it is crucial to distinguish siabhra from the more aristocratic Tuatha Dé Danann; siabhra are often seen as more
elemental, mischievous, or ambiguous. Poets use this term to evoke a
sense of pervasive, unseen presence in the landscape, particularly in misty or twilight settings. The singular usage in Campbell’s poem personifies the collective folkloric force into a single, gentle navigator, illustrating how poetic license can reshape communal myths into intimate, comforting
imagery for specific narrative
purposes like a lullaby.