Question: When did Echthighern Mac Cennétig's father die?
Sentence (from "Echthighern mac Cennétig"): Echthigern was the progenitor of Irish families Anglicized Ahearn, Ahern and O'Hearn with other spelling variations, in addition to Mac Craith (McGrath, etc.), Mac Gonigle (Gunnell), and O'Quirk.
Relevant evidence: No