In the early Middle Ages, southern County Antrim was part of the Kingdom of Ulidia. It was ruled by the Dál Fiatach clans Keenan and MacDonlevy/McDunlavey. The north was part of Dál Riada, which stretched into what is now western Scotland over the Irish Sea. Dál Riada was ruled by the O'Lynch clan. The Dál nAraide and the Cruthin, who were pre-Gaelic Celts and probably related to the Picts of Britain lived in lower County Antrim. Between the 8th and 11th centuries there were Vikings in Antrim too.