Dictionary of Welsh Biography

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SEIRIOL ( c. 500- c. 550 ), founder and first abbot of Penmon church ;

son of Owain Danwyn ab Einion Yrth ap Cunedda Wledig , and so a second cousin of king Maelgwn Gwynedd (q.v.) and of the same age as the latter. According to Anglesey tradition, he was a great friend of S. Cybi (q.v.) . Seiriol was the chief saint of the Dindaethwy district in Anglesey and also of Penmaenmawr, Caerns. ; his feast day, according to the earliest calendars, was 1 Feb.


  • Baring-Gould and J. Fisher , The Lives of the British Saints , iv, 177-80;
  • H. H. Hughes and H. L. North , The Old Churches of Snowdonia (Bangor, 1924) , 1-26, 160-3.


Chancellor John Williams James, D.D., Aber, Bangor

Published date: 1959