18Kristjánsson, Jónas. Eddas and Sagas: Iceland's Medieval Literature. Reykjavík: Hiđ íslenska Bókmenntafélag, 1988 (1894).
Translation courtesy of Gudrun Helga Jonasdottir. The 1894 edition may be read online here. A part of this quotation was first used by Seán Duffy in an Irish Times article.
After Brodar, Brian Boru’s assassin, was captured by the Dalcassians he was tortured to death by Brian's brother, Ulf the Quarrelsome, "by having his entrails wound about a tree while he was living." (Newman, Roger Chatterton. Brian Boru, King of Ireland. Dublin: Anvil, 1983. 174-76.)