Artgal mac Cathail
He was the son of Cathal mac Muiredaig Muillethan ( died 735 ) , a previous king and brother of Dub-Indrecht mac Cathail ( died 768 ) . 
<triplet> Cathal mac Muiredaig <subj> Dub-Indrecht mac Cathail <obj> child <triplet> Dub-Indrecht mac Cathail <subj> Cathal mac Muiredaig <obj> father