In particular, we have this entry:
Uair robo tarisi le macaib Ruaidri a n-airecht fein arna cuired do cech oen fo leth dib-sin, acht mad Cormac mac Tomaltaig Meic Diarmata & Dauith O Flainn & a aes grada archena.
– Annála Connaught, 1225
The sons of Rory felt confidence in their own lieges, having been asked to come into the country by each one separately, except Cormac son of Tomaltach McDermot with David O Flynn and the rest of his officers.
– Annals of Connaught, 1225
David O Flynn is the Chieftain of the title and the story involves the war between the O Conner cousins over the kingship following the death of Cathal of the Red Hand O Conner.