Kalends of January
[...]
. AD 817.
Muiredach son of Bran, one of two kings of Laigin, dies.
There was abnormal ice and much snow from the Epiphany to Shrovetide. The Bóinn and other rivers were crossed dry-footed; lakes likewise. Herds and hunting-parties were on Loch nEchach, and wild deer were hunted. The materials for an oratory were afterwards brought by a large company (?) from the lands of Connacht over Upper and Lower Loch Éirne into Tír Ua Crimthainn; and other unusual things were done in the frost and hail.
Cellach son of Scannlán, abbot of Cell Fhoibric, and Cernach son of Congalach, king of Cnodba, die.
Cuanu, abbot of Lugmad, went into exile into the lands of Mumu with the shrine of Mochta.
Artrí, superior of Ard Macha, went to Connacht with the shrine of Patrick.
Aed son of Niall went with forces to Dún Cuair and divided Laigin between the two grandsons of Bran.
The superior of Cell Mór Enir was dishonoured, and Dub Innrecht, its prior, was killed by the Laigin while under his protection.
Cellach son of Fogartach plundered a vessel (?) to the detriment of Conchobor son of Muiredach, viz. the son of the king of Laigin.
A battle, i.e. the battle of Forath, was fought in the territory of Delbna Nuadat, in which the Uí Maini with their king, i.e. Cathal son of Murchad, and very many other nobles, were overthrown. The kings of the Uí Briúin, i.e. Diarmait son of Tomaltach and Mael Cothaid son of Fogartach, were victors.
Rechtabra grandson of Andola, abbot of Daiminis, dies.
A third part of Cluain Moccu Nóis was again burned on the twelfth of the Kalends of November 21 October.