Kalends of January
. AD 720.
Dúnchad Bec, king of Cenn Tíre, dies.
An earthquake in October.
A battle between the Connachta and Corco Baiscinn, in which Talamnach's son fell.
The killing of Cú Dínaisc, son of Rothechtach.
Death of Maenach, abbot of Lann Léire.
The wasting of Mag Breg by Cathal son of Finnguine, and by Murchad son of Bran.
Death of Cuanna of Ros Eó.
An invasion of the Laigin by Fergal, and the cattletribute was imposed and the hostages of the Laigin secured for Fergal son of Mael Dúin.
Inmesach the religious established a law with the peace of Christ over the island of Ireland.