Kalends of January
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. AD 818.
The laying waste of Laigin by Aed son of Niall, i.e. the land of Cualu as far as Glenn dá Locha.
Death of Aed son of Niall—Aed the eminent son of Niall of the showers—near Áth dá Ferta in the plain of Conaille.
A skirmish between the Cenél Eógain and the Cenél Conaill in which Mael Bresail son of Murchad, king of Cenél Conaill, fell. Murchad son of Mael Dúin was victor.
A skirmish between the Ulaid themselves, in which Cairell son of Fiachna fell and Muiredach son of Eochu was victor.
Cathal son of Dúnlang, king of Uí Cheinnselaig and prior of Ferna, dies.
Crunnmael son of Ailill, superior of Dam Liac, and Muiredach son of Crunnmael, abbot of Dísert Teornóc, died.
Congalach son of Fergus, king of Fir Chúl, dies.
At Ard Macha Whitsun 5 June was not publicly celebrated nor the shrine taken on tour; and there was a disturbance in which the son of Echaid son of Fiachna fell.
Fothad of Othan dies.