Diarmaid mac Taidhg Ua Ceallaigh, 38th King of Uí Maine and 3rd Chief of the Name, died 1065.
An entry in the Annals of the Four Masters, sub anno 1065, identifies him as Diarmaid mac Taidhg Ua Ceallaigh: The plundering of Cluain-mic-Nois by the Conmhaicni and Ui-Maine.
Ua Conchobhair (Aedh) came against them, and defeated them, through the miracles of God, Ciaran, and Brenainn, whose churches they had plundered; and a bloody slaughter was made of them by Aedh; and they left their boats with him, together with the ship which they had carried from the sea eastwards, through the middle of Connaught, to the Shannon.
Aedh Ua Ruairc escaped from this conflict, but he died without delay afterwards, through the miracles of Ciaran.
He is listed as being succeeded by Dunchadh Ua Cellaig, who is presumed to have been his victorious rival.