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Wiki information Cernaig:
Niall mac Cernaig Sotal was a king in southern Brega of the Uí Chernaig sept of Lagore of the Síl nÁedo Sláine. He was the grandson of the high king Diarmait mac Áedo Sláine. His father Cernach Sotal had died during plague years in 664.
Cathal mac Néill or Cathal Cerr or Cathal Corc was a king of Southern Brega at Lagore. He belonged to the Uí Chernaig sept of the Síl nÁedo Sláine branch of the southern Uí Néill. He was the son of Niall mac Cernaig Sotal and great-grandson of the...