Demmán_mac_Cairill
Demmán mac Cairill (died 572) was a king of the Dál Fiatach, and over-king of Ulaid in Ireland. He was the son of Cairell mac Muiredaig Muinderg (died 532), a previous Ulaid king and brother of Báetán mac Cairill (died 581).[1] He ruled the Dál Fiatach and Ulaid from 557 to 572.[2]