Besides the Ulidians and Dál Riada , there were the Dál nAraide of lower County Antrim , and the Cruthin , who were pre-Gaelic Celts and probably related to the Picts of Britain .
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 .