Cethernach ua Ermono (died 768) was Abbot of Clonfert.
References[edit]
- Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork
- Annals of Tigernach at CELT: Corpus of Electronic Texts at University College Cork
- Revised edition of McCarthy's synchronisms at Trinity College Dublin.
- Byrne, Francis John (2001), Irish Kings and High-Kings, Dublin: Four Courts Press, ISBN 978-1-85182-196-9
- Lysaght, Eamonn (1978), The Surnames of Ireland. ISBN 0-7165-2278-0, pp. 233–34.