Saint Gwinear
Saint Gwinear was a Celtic martyr, one of only two early Cornish saints whose biographies survived the Reformation. The Life of Gwinear was written in the early 14th century by a priest named Anselm, and has sometimes been printed among Saint Anselm's works.
Born in Ireland with the Irish name of Fingar, he was converted to Christianity by Saint Patrick and after spending time in Brittany went with 7 (or 777) companions to Cornwall, landing at Hayle, where he was martyred by King Teudar.
The Victorian clergyman, hagiographer and antiquary Sabine Baring-Gould believed that an Irish group, driven from their homeland in Ossory in the fifth century, invaded Penwith (="pen-gwaeth", the "bloody headland"), and that the legend of Gwinear was a distorted recollection of these events.
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Footnotes
↑ Doble (1960) includes a translation of a large part of the text in which the saint's name is given as Guigner; Doble suggests that the Breton form indicates a connection with Brittany where the saint is also venerated.