Kalends of January
[...]
. AD 857.
The bishop and anchorite Cumsud, superior of Cluain Iraird, rested in peace.
Cinaed son of Ailpín, king of the Picts, and Ethelwulf, king of the Saxons, died.
Tipraite the Pale, abbot of Tír dá Glas, died.
Mael Sechnaill son of Mael Ruanaid came with the men of Ireland to the lands of Mumu and halted for ten nights at Niam; and he plundered them to the south as far as the sea, after their kings had been defeated at Carn Lugdach, Maelchrón son of Muiredach, king of the Déisi, being left dead there. Mael Sechnaill then took the hostages of Mumu from Belat Gabráin to Inis Tarbnai off the Irish coast, and from Dún Cermna to Ára Airthir.
A rainy autumn destructive to the fruits of the earth.