Olcobhar mac Cummuscach (died 820) was Abbot of Clonfert.
References
- 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.
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