son of Owain Danwyn ab Einion Yrth ap Cunedda Wledig, and so a second cousin of king Maelgwn Gwynedd and of the same age as the latter. According to Anglesey tradition, he was a great friend of Saint Cybi. Seiriol was the chief saint of the Dindaethwy district in Anglesey and also of Penmaenmawr, Caernarfonshire; his feast day, according to the earliest calendars, was 1 February
Published date: 1959
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