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Wiki information Gredifael:
Saint Gredifael is the patron saint and founder of St. Gredifael's Church, Penmynydd, in Anglesey, Wales. According to Enwogion Cymru, Gredifael was a saint who lived in the early part of the sixth century. He was one of the sons of Ithel Hael, and...
Ithel Hael or Ithel Hael o Lydaw was a prince of Armorica who lived in the early part of the sixth century. He was the father of Baglan, Flewyn, Gredifael, Tanwg, Twrog, Tegai, Trillo, Tecwyn and Llechid, saints who accompanied Cadfan to Britain.