Ireland’s Tuatha dé Danann: Myth or History?   If you were an Irish school child before World War II, you’d have learned your history began with the Mythological Cycle, accounts written by medieval monks based on oral tradition going back at least two millennia. Though these texts were considered factual until the 1940s, later historians regarded them as fabulous tales suitable only for fireside storytelling.   One of the texts, the Lebor Gabála Érenn (The Book of the Takings of Ireland,