17O'Kelly, Michael J., and Claire O'Kelly. Newgrange: Archaeology, Art, and Legend. London: Thames and Hudson, 1982. 45-47.
The Dagda was called the "Good God" not because he was "good" in the sense of beneficent, but because he was considered "good for everything." The Dagda, who defeated Lugh at the Battle of Uisneach, was ultimately "one and the same" as his son Aengus Óg.