A Gaelic overkingdom straddling the North Channel between western Scotland (Argyll) and northeastern Ireland (Antrim), at its height in the 6th-7th centuries, that merged with Pictland under Cináed mac Ailpín (c. 843) to form the Kingdom of Alba, the ancestor of medieval Scotland.
Merged with the Kingdom of the Picts to form the Kingdom of Alba under Cináed mac Ailpín, c. 843-850.
Accessible modern account of Britain's fifth- to seventh-century kingdoms in the age of Arthur.