Dunadd

Its territory covered north-eastern parts of Ireland in what later became County Antrim, part of the mainland of Great Britain in what is now western Scotland, and numerous islands in the Inner Hebrides.

A fortress at Dunadd in the Kilmartin Glen, four miles or six kilometers north-west of the modern town of Lochgilphead, served as the main seat of the kingdom.

Dál Riata fragmented in the ninth century during the Viking age.

The part in Ireland was absorbed into the Kingdom of Ulaid, the islands came under the control of the Kingdom of the Isles, and the part on mainland Britain was united in eight forty-three AD with the Pictish kingdom to its east under Kenneth MacAlpin to become the Kingdom of Alba.