The Martyrology of Donegal gives Euhel's feast-day as 14 November as follows- “The three sons of Dubhthach, i.e., Fachtna of Cill-Toma, Gabhran and Euhel, the other two.”
The Martyrology of Gorman (Félire Uí Gormáin), for the same day gives- “Dear are the pure-formed, three godly sons of Dubthach”.
Loca Patriciana. No. V. The Druids, Dubhtach Mac Ui Lugair and His Sons, Rev John Francis Shearman - The Journal of the Royal Historical and Archaeological Association of Ireland, 1874.
'The Martyrology of Donegal' ed. John O'Donovan, 1864.
'The Martyrology of Gorman' ed. Whitley Stokes, 1895.
Pádraig Ó Riain, Corpus genealogiarum sanctorum Hiberniae. Dublin, 1985, Section 670.72