These supernatural spirits ruled the dead. There were two classes: the Tuatha De Danann, "the people of the goddess Danu," gods of light and life; and spirits of darkness and evil. The Tuatha had their chief seat on the Isle of Man, in the middle of the Irish Sea, and brought under their power the islands about them. On a Midsummer Day they vanquished the Fir Bolgs and gained most of Ireland, by the battle of Moytura.
A long time afterwards—perhaps 1000 b. c.—the Fomor, sea-demons, after destroying nearly all their enemies by plagues, exacted from those remaining, as tribute, "a third part of their corn, a third part of their milk, and a third part of their children." This tax was paid on Samhain. It was on the week before Samhain that the Fomor landed upon Ireland. On the eve of Samhain the gods met them in the second battle of Moytura, and they were driven back into the ocean.
As Tigernmas, a mythical king of Ireland, was sacrificing "the firstlings of every issue, and the scions of every clan" to Crom Croich,
