 Their territory was in County Fermanagh.Clann Ceallaigh descend from Cellach, son of Tuathal, king of the Uí Chremthainn, who in turn was descended from Daimine, one of the sons of Cairpre Dam Argait, and are part of the Síl Daim Argait.Clann Ceallaigh's name is preserved as the name of the modern barony of Clankelly in County Monaghan.