"Genealogies of the British Saints", supposedly from the book of Thomas Hopkin of Coychurch (1670), cited in the Jolo Manuscripts, p. 506, although note that the Iolo Manuscripts are marred by Edward William's forgeries and spurious additions to their content.
Llwyd, Richard. "Topographical Notices &c." in Powell & Wynne's translation of Caradoc's History of Wales, Rev. ed., p. 88. J. Eddowes (Shrewsbury), 1832.
The Catholic Church in England and Wales. "Liturgy Office: November 2015". Catholic Bishops' Conference of England and Wales, 2014. Accessed 18 Nov 2014.