Kalends of January
. AD 859.
Mael Sechnaill, king of Temair, led an army of the Laigin and Mumu and Connacht and the southern Uí Néill into the North, and he halted at Mag Dumai near Ard Macha. Aed son of Niall and Flann son of Conaing attacked their camp by night and killed some people in the middle of the camp; and Aed was subsequently overcome and left many dead behind him, Mael Sechnaill's army holding to its position.
Aed son of Dub dá Bairenn, king of Uí Fhidgeinte, dies.
Flannacán son of Colmán dies.
Niall son of Iallán, who suffered from paralysis for thirty-three years and was disturbed by frequent visions both false and true, rested in Christ.