Tuatha de Dannan
From them are the Tuatha Dé and Andé, whose origin the learned do not know, but that it seems likely to them that they came from heaven, on account of their intelligence and for the excellence of their knowledge.
The Tuath Dé dwell in the Otherworld but interact with humans and the human world. They are associated with ancient passage tombs, such as Brú na Bóinne, which were seen as portals to the Otherworld. Their traditional rivals are the Fomorians (Fomoire), who seem to represent the harmful or destructive powers of nature, and who the Tuath Dé defeat in the Battle of Mag Tuired. Each member of the Tuath Dé has associations with a particular feature of life or nature, but many appear to have more than one association. Many also have bynames, some representing different aspects of the deity and others being regional names or epithets.
Mythology & Lore
Led by king Nuada, they fought the First Battle of Magh Tuireadh on the west coast, in which they defeated and displaced the native Fir Bolg, who then inhabited the island. In the battle, Nuada lost an arm to their champion, Sreng. Since Nuada was no longer "unblemished", he could not continue as king and was replaced by the half-Fomorian Bres, who turned out to be a tyrant. The physician Dian Cecht replaced Nuada's arm with a working silver one and he was reinstated as king. However, Dian Cecht's son Miach was dissatisfied with the replacement so he recited the spell, "ault fri halt dí & féith fri féth" (joint to joint of it and sinew to sinew), which caused flesh to grow over the silver prosthesis over the course of nine days and nights. However, in a fit of jealous rage Dian Cecht slew his own son. Because of Nuada's restoration as the leader, Bres complained to his family and his father, Elatha, who sent him to seek assistance from Balor, king of the Fomorians.
The Tuatha Dé Danann then fought the Second Battle of Magh Tuireadh against the Fomorians. Nuada was killed by the Fomorian king Balor's poisonous eye, but Balor was killed by Lugh, champion of the Tuatha Dé, and who then took over as king.
A third battle was fought against a subsequent wave of invaders, the Milesians, from the northwest of the Iberian Peninsula (present-day Galicia and Northern Portugal), descendants of Míl Espáine (who are thought to represent the Goidelic Celts). The Milesians encountered three Tuatha Dé Danann goddesses, Ériu, Banba and Fodla, who asked that the island be named after them; Ériu is the origin of the modern name Éire, and Banba and Fodla are still sometimes used as poetic names.
Their three husbands, Mac Cuill, Mac Cecht and Mac Gréine, were kings of the Tuatha Dé Danann at that time, and asked for a truce of three days, during which the Milesians would lie at anchor nine waves' distance from the shore. The Milesians complied, but the Tuatha Dé Danann created a magical storm in an attempt to drive them away. The Milesian poet Amergin calmed the sea with his verse, then his people landed and defeated the Tuatha Dé Danann at Tailtiu. When Amergin was called upon to divide the land between the Tuatha Dé Danann and his own people, he cleverly allotted the portion above ground to the Milesians and the portion underground to the Tuatha Dé Danann. The Tuatha Dé Danann were led underground into the Sidhe mounds by Manannán mac Lir and Tir na nOg onto a flowery plain/plain of honey attested to in the Voyage of Bran.
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