Domangart Réti succeeds his father Fergus Mór after he dies during a campaign against the Picts.

He becomes the new king of Dál Riata (modern Scotland).

This according to the Annals of Tigernach.

Áedán mac Gabráin, following the death of his uncle Conall mac Comgaill, becomes king of Dalriada, or Dál Riata, a kingdom of uncertain origins comprising modern Argyll, Scotland, and County Antrim, Ireland, from about 574 onward.

He is one among several kings in Dál Riata and many in northern Britain and Ireland.

It appears that the Picts were not the dominant power in northern Britain for the entire period.

The Gaels of Dál Riata control their own region for a time but in the first third of the seventh century suffer a series of defeats.

Domnall's fleet destroys the naval force of Dál Riata at the Mull of Kintyre.