733 AD - Aedh Allan, King of Ireland, assembled the forces of Leath Chuinn, to proceed into Leinster; and he arrived at Ath Seanaith. The Leinstermen collected the greatest number they were able, to defend his right against him. A fierce battle was fought between them. The king, Aedh Allan himself; went into the battle, and the chieftains of the North along with him. The chieftains of Leinster came with their kings into the battle; and bloodily and heroically was the battle fought between them both. Heroes were slaughtered, and bodies were mutilated. Aedh Allan, and Aedh, son of Colgan, King of Leinster, met each other in single combat; and Aedh, son of Colgan, was slain by Aedh Allan. The Leinstermen were killed, slaughtered, cut off, and dreadfully exterminated, in this battle, so that there escaped of them but a small remnant, and a few fugitives. The following were the leaders and chieftains of the Leinstermen who fell, namely: Aedh, son of Colgan, King of Ui Ceinnsealaigh; Bran Beg, son of Murchadh, the second king who was over the Leinstermen; Fearghus, son of Maenach, and Dubhdacrich, two lords of Fotharta; the son of Ua Ceallaigh; the son of Trian; Fiangalach Ua Maeleaithgin; Conall Ua Aithechdai; the four sons of Flann Ua Conghaile; Eladhach Ua Maeluidhir; and many others, whom it would be tedious to enumerate. The people of Leath Chuinn were joyous after this victory, for they had wreaked their vengeance and their animosity upon the Leinstermen. Nine thousand was the number of them that was slain.