Ruthmael (died 824) was Abbot and Bishop of Clonfert.

• 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.