Kalends of January
. AD 816.
Death of Dathal grandson of Duibléne, a bishop, scribe and anchorite.
Death of the scribe Cú Chruithne, superior of Lann Ela.
Tipraite, abbot of Cluain Ferta Brénainn, and Cumuscach son of Cernach, steward of Ard Macha, died.
A skirmish between the men of southern Brega and the Cianachta, in which many of the Cianachta fell.
Cathal son of Dúnlang and the community of Tech Munna won a battle against the community of Ferna, in which four hundred were slain.
Mael Tuile, abbot of Bennchor, goes into exile.
Mael Dúin son of Cenn Faelad, superior of Ráith Both, a member of Colum Cille's community, was slain.
Colum Cille's community went to Temair to excommunicate Aed.
Mael Dúin, king of Ros, dies.
Donngal son of Tuathal, king of Ard, dies.
Cilléne, abbot of Ferna, dies.
Fergus of Ráith Luraig, abbot of Finnglas, dies.
Siadal, abbot and bishop of Ros Comáin, fell asleep.