Seiriol

Oxford Dictionary of National Biography

S. Baring-Gould and John Fisher The Lives of the British Saints (London: Honourable Society of Cymmrodorion, 1913), 177⁠–80    View online

David Farmer The Oxford Dictionary of Saints (Oxford: Oxford University Press, 2011), 392

Elissa Henken Traditions of the Welsh Saints (Cambridge: D.S. Brewer, 1987), 238⁠–9, 363

David E. Thornton 'Seiriol [St Seiriol] (fl. 6th cent.)' in Oxford Dictionary of National Biography (Oxford: Oxford University Press, 2004)    View online