Ua Dubthaig was member of a Connacht ecclesiastical family originally from Lissonuffy in what is now north-east County Roscommon.
The History of the Popes describes him as: a person of great talent; and was employed in much important business, of Church and State, both in England and at Rome.
The Irish annals merely record that Cadla Ua Dubthaig, i.e. archbishop of Connachta, rested in Cunga Feíchín.
The Annals of Tigernach say that he brought the final text of the Treaty of Windsor back to the Irish king Rory O'Conor in 1175.
This article about a Roman Catholic archbishop from Ireland is a stub.