Read "The Boyhood of Fionn" by James Stephens online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
It is to be known that on the night of the Feast of Samhain the doors separating this world and the next one are opened, and the inhabitants of either world can leave their respective spheres and appear in the world of the other beings.
Now there was a grandson to the Dagda Mor, the Lord of the Underworld, and he was named Aillen mac Midna, out of Shí Finnachy, and this Aillen bore an implacable enmity to Tara and the Ard-Rí.