Domhnall Ua Dubhthaigh, Archbishop of Connacht, died 1136.

The post of Archbishop of Connacht was a precursor to that of Archbishop of Tuam.

His death is noted in the Annals of the Four Masters as follows:

Domhnall Ua Dubhthaigh, Archbishop of Connaught, and successor of Ciaran, head of the wisdom and hospitality of the province, died after mass and celebration at Cluain-fearta-Brenainn.

The Annals of Loch Cé have his obit sub anno 1137, describing him as "Domhnall Ua Dubhthaigh, bishop of Elphin, and comarb of Ciaran of Cluain-mic-Nois."

References

• http://www.irishtimes.com/ancestor/surname/index.cfm?fuseaction=History&Surname=duffy&UserID=
• http://www.ucc.ie/celt/online/T100005B/text025.html
• http://www.ucc.ie/celt/online/T100013/text002.html
• Episcopal Hierarchy in Connacht and Tairdelbach Ua Conchobair, Colman Etchingham, Journal of the Galway Archaeological and Historical Society, vol. 52, 2000, pp. 13–29.
• Irish Kings and High Kings, Francis John Byrne (1971); 3rd revised edition, Dublin: Four Courts Press, 2001. ISBN 978-1-85182-196-9
• A very puzzling Irish Missal, John A. Claffey, Journal of the Galway Archaeological and Historical Society, Volume 55, 2003, pp. 1–12.
• The Inauguration site of Tairrdelbach Ua Conchobair, Elizabeth FitzPatrick, in Assembly Places and Practices in Medieval Europe, ed. Aliki Pantos and Sara Temple, Four Courts Press, Dublin, 2004. ISBN 1-85182-665-3.