Lug
He is not the supreme god, but rather a god “without function” because he has all functions: he is, in effect, Samildanach, or the “Many-Skilled Craftsman.”
He corresponds to the Gallic Mercury of whom Caesar speaks, and who has given his name to numerous European cities such as Lyon, Loudun, Laon, Leiden, and Leipzig, which are so many “Lugdunum,” that is, “Fortresses of Lug.”
Lug belongs to the Tuatha Dé Danann through his father, but to the Fomorians through his mother. In the Second Battle of Mag Tuired, he establishes himself as the leader of the Tuatha Dé Danann—though not as their king—and leads them to victory, killing his own grandfather Balor, he of the baneful eye.
He is the hero of several tales of fantastic adventure. Tradition made him the actual father of the hero Cú Chulainn. The name “Lug” comes from an Indo-European word meaning “white” or “luminous,” but also “raven.” The raven, then, appears to be linked to Lug.
Some have seen in Cú Chulainn and in Lancelot heroicized aspects of Lug, which would not be impossible. The epithet often applied to him, “of the long arm,” is suggestive of Lancelot.
Lug possesses a solar aspect, but he is not a god of the Sun, for among the Celts the solar divinity is feminine.