Note 26 — Chapter III
Reading edition
One branch of the Dál Riada settled in Scotland in the third century, and their kinsfolk from Ulster kept constantly crossing over and assisting them in their struggles with the Picts. They were recruited also by some other minor emigrations of Irish Picts and Milesians. Their complete supremacy over the Picts was not obtained till the beginning of the sixth century. It was about the year 502 that Fergus the Great, leading a fresh and powerful army of the Dál Riada into Scotland, first assumed for himself Royal authority which his descendants retained for 783 years, down to the reign of Malcolm IV., slain in 1285. It was not, however, till about the year 844 that the Picts, who were almost certainly a non-Aryan race, were finally subdued by King Keneth Mac Alpin, who completely Gaelicised them.