1Cross, Tom Peete, and Clark Harris Slover. Ancient Irish Tales. New York: Barnes & Noble, 1936. 514-17. Original from Book of Ballymote (Leabhar Bhaile an Mhóta) c. 1391 Royal Irish Academy MS 23 P 12 fol., 7, p,b, col. b.
This tale may be read in its entirety here. The synopsis of this story is: Eochaid, the King of Leinster, escaped from Niall of the Nine Hostages at Tara, where he was being held prisoner. Eochaid fled toward his home country, pursued by Niall. He tried to find refuge in the home of Laidgrinn, a poet. He was refused sanctuary and in revenge burned the man's house. Niall caught up with him and brought him to his camp at Ath Fadat (Tullow) where he was fastened to the Holed Stone, and subsequently escaped by killing the nine men Niall had sent to execute him.