Dalriada or Dál Riata (as it was called in Ireland) was the kingdom of the Scots who migrated from County Antrim in Ulster to Argyll and eventually gave their name to Scotland.
Dunadd, in Argyll, was probably the seat of the kings of Dalriada.
A census of Dalriada exists, the Senchus fer n'Alba.
Amongst the kings of Dalriada, the succession alternated between the descendants of Erc, with those of Fergus dominating.
At the time of Ferchar Fota's reign, Dalriada was a weakened kingdom; the throne was fleetingly held by the various claimants, and the Scots were dominated by the Picts.
3 Ruadri was the brother of Muiredach, the last king of Dalriada to come from the Tribe of Loarn (died around 736).