8"Niall of the Nine Hostages." Wikipedia. Wikimedia Foundation, 06 Nov. 2012. Web. 11 June 2012. <http://en.wikipedia.org/wiki/Niall_of_the_Nine_Hostages>.
According to this entry, "The sources for the details of Niall's life are genealogies of historical kings, the "Roll of Kings" section of the Lebor Gabála Érenn, Irish annals such as the Annals of the Four Masters, chronicles such as Geoffrey Keating's Foras Feasa ar Éirinn, and legendary tales like "The Adventure of the Sons of Eochaid Mugmedon" and "The Death of Niall of the Nine Hostages". These sources date from long after Niall's time and their value as history is limited at best...the traditional roll of kings and its chronology is now recognised as artificial. The High Kingship did not become a reality until the ninth century, and Niall's legendary status has been inflated in line with the political importance of the dynasty he founded."