Фир Болг
John Rhys and R. A. Stewart Macalister suggest that the Fir Bolg are the Fomorians (Fomoire) under another guise. Macalister notes that the Fir Bolg are the only group of settlers who are not harried by the Fomorians. The Tuath Dé fight two similar battles at Mag Tuired, one against the human Fir Bolg and one against the supernatural Fomorians. The Fir Bolg lead the Fomorians to the second battle. The Fomorians seem to have represented the harmful or destructive powers of nature, while the Tuath Dé represented the gods of growth and civilization.