Dál Riata

Dál Riata or Dál Riada (also Dalriada) (/dælˈriːədə/) was a Gaelic overkingdom that included parts of western Scotland and northeastern Ireland, on each side of the North Channel. At its height in the late 6th–early 7th centuries, it encompassed roughly what is now Argyll in Scotland and part of County Antrim in the Irish province of Ulster.

In Argyll, it consisted of four main kindreds each with their own chief:

Latin sources often referred to the inhabitants of Dál Riata as Scots (Scoti), a name originally used by Roman and Greek writers for the Irish who raided Roman Britain. Later, it came to refer to Gaelic-speakers, whether from Ireland or elsewhere. They are referred to herein as Gaels, an unambiguous term, or as Dál Riatans.

The hillfort of Dunadd is believed to have been its capital. Other royal forts included Dunollie, Dunaverty and Dunseverick. Within Dál Riata was the important monastery of Iona, which played a key role in the spread of Celtic Christianity throughout northern Britain, and in the development of Insular art. Iona was a centre of learning and produced many important manuscripts. Dál Riata had a strong seafaring culture and a large naval fleet.

...
Wikipedia