Kalends of January
[...]
. AD 673.
The killing of Congal Cennfhatar son of Dúnchad, king of Ulaid. Béc of Bairche killed him.
The killing of Dor son of Maeldub, king of Cianacht.
Death of Scannlan son of Fingen, king of Uí Méith.
A thin and tremulous cloud in the shape of a rainbow appeared at the fourth vigil of night on the sixth feria preceding Easter, extending from east to west through a clear sky. The moon became the colour of blood.