Around 140 separate Celtic saints were venerated in Cornwall. Later, it was assumed most of them came from elsewhere, from Wales, Brittany or Ireland, even though many were in fact probably native to Cornwall. As time passed, saints became the object of local folklore. In imagining the histories of their saints, the Cornish revealed how they saw themselves. Nicholas Orme (in his Cornwall and the Cross, p.18) has written that ‘between about AD 900 and 1500 … people in Cornwall … saw their past as linked with Ireland and Wales, not with England or Rome’.
Various miraculous events were associated with Cornwall’s saints. Cuby and Piran could carry fire without being burnt. Petroc lived on an island in the Indian Ocean for seven years sustained by a single fish, while Carantoc possessed a magic perambulating altar. This sailed of its own volition across the Severn from Wales with the saint hot in pursuit. Once across the Severn Carantoc had to tame a serpent that was annoying the locals. The same district near Bristol seems to have been particularly infested with serpents as Keyne turned them to stone by her praying. Not all serpents and dragons were being slain by the score in what was becoming England. Samson had to deal with one on his way through Cornwall for example.

Arthur figured in relation to several saints. Carantoc was assisted by Arthur when taming his dragon, while Kea returned to Cornwall from Brittany to broker a peace deal between Arthur and Modred. Endelient was the god daughter of Arthur, who had helped her when a local lord killed her cow. When she died, Endelient’s body was dragged in an ox-cart and the church built at the place the oxen stopped, something that also happened to Mylor.
Some saints were incredibly strong. Morwenna carried a stone for the font of her church on her head from the shore up the cliffs to the spot she chose. Selevan cracked a stone with a single blow of his fist. Menfre or Minver could fight off the devil merely by throwing her comb at him.
Saints seem to have had more than their fair share of bad luck. When a child, Mylor, son of a duke of Cornwall, had his hand and foot chopped off by an evil uncle. He received silver replacements that miraculously grew with him. Blaise was tortured with woolcombs but then very forgivingly became the patron saint of woolcombers. Selevan caught two fish with a single hook to feed the two children of his sister Breage. Unfortunately, the children choked on the bones. Gwinear was beheaded at the site of his church, massacred by the Cornish pagan King Teudar along with the rest of the company of 777 that he had brought with him from Ireland.
Sancred killed his father by accident and had to live as a swineherd in penance, later being revered for his ability to cure pigs. According to Nicholas Orme, in 1677 the too-clever vicar of Sancreed was prosecuted by his parishioners for unwisely saying that he was ‘the unhappiest of ministers, for that other ministers were patrons of their flocks but that he was but the herdsman of a company of swine’.
And finally, saints could make what look like quite odd decisions. God offered Sithney the chance to be the patron of young women, No, replied the misogynist, for they’ll always be pestering me asking for husbands and fine clothes. Instead he chose to be the patron of mad dogs. Much less trouble.

I went to St Neot school as a child and we often learned about the magical doings of St Neot. They are recounted here: https://orthochristian.com/81326.html . The St. Neot community website has rather more sober historical information, including on the likelihood that the St Neot grew up in Glastonbury, preached in Cornwall and was eventually buried in Huntingdonshire. http://www.stneot.org.uk/the_saint_neot_.html
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