http://en.wikipedia.org/wiki/M%C3%A1el_D%C3%BAin_mac_M%C3%A1ele_Fithrich

Máel Dúin mac Máele Fithrich

Máel Dúin mac Máele Fithrich (died 681) was a King of Ailech and head of the Cenél nEógain branch of the northern Uí Néill. He was the son of Máel Fithrich mac Áedo (died 630) and grandson of the high king Áed Uaridnach (died 612).[1] He ruled as King of Ailech from circa 668-681.[2]

...

He had married Cacht ingen Cellaig, daughter of the high king Cellach mac Máele Coba (died 658) of the Cenél Conaill and their son Fergal mac Máele Dúin (died 722) was high king of Ireland.

Máel Dúin mac Máele Fithrich is recorded as the ancestor of the Ó Dálaigh bardic family in the O'Clery Book of Genealogies.[7]

Called Man of the Brown Pools

Duinh

Maelduin