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prénoms celtiques et bretons d'Albert Deshayes :
La Vie de ce saint est imitée de celle de Cieran, un saint irlandais qui fut évêque de Saighir, honoré en Cornwall sous le nom de Perran. Cette assimilation est due aux moines copistes médievaux. Des traditions corniques rapportent qu'il serait venu d'Irlande sur une meule de moulin. Il aurait construit un monastère sur la côte nord et y serait mort. Une église en ruines, à Perranzabuloe, contenaient ses reliques.
Dans l'église paroissiale de Trézilidé (29), il est représenté, tête nue, les mains levées en signe de bénédiction. Ce saint pourrait avoir quelque rapport aavec Petran, père de Padern.
Site en.Wikipedia :
Saint Piran or Perran (traditionally in Cornwall, saints are simply named, without this title) is an early 6th century Cornish abbot and saint, supposedly of Irish origin.
He is the patron saint of tin-miners, and is also generally regarded as the patron saint of Cornwall, although Saint Michael and Saint Petroc also have some claim to this title. Saint Piran's Flag is a white cross on a black background. Saint Piran's Day is 5 March.
Suggested Irish origins
Piran is the most famous of all the saints said to have come to Cornwall from Ireland. By at least the 13th century, he had become identified with the Irish Saint Ciarán of Saighir who founded the monastery at Seirkieran (Saighir) in County Offaly. This was due to the widely recognised ability of the P-Celtic or Brythonic letter 'P' to transform into the Q-Celtic or Gaelic letter 'C'. The 14th century 'Life of Saint Piran', probably written at Exeter Cathedral, is a complete copy of an earlier Irish life of Saint Ciarán of Saighir, with different parentage and a different ending that takes into account Piran's works in Cornwall, and especially details of his death and the movements of his Cornish shrine; thus "excising the passages which speak of his burial at Saighir" (Doble).
However, there is no shrine to him in Ireland. 5 March is the traditional feast day of both Saint Ciarán of Saighir and Saint Piran, but the Calendar of Launceston Church records an alternative date of 18 November for the latter. Charles Plummer suggested that Piran might, instead, be identified with Saint Ciarán of Clonmacnoise, who founded the monastery of Clonmacnoise also in County Offaly but this is doubtful since this saint is believed to have died of yellow fever at the age of thirty-two and was traditionally buried at Clonmacnoise. His father is, however, sometimes said to have been a Cornishman. J. Loth, moreover, has argued, on detailed philological grounds, that the two names could not possibly be identical. G. H. Doble thought that Piran was a Welshman from Glamorgan, citing the lost chapel once dedicated to him in Cardiff.
David Nash Ford accepts the Ciarán of Clonmacnoise identification, whilst further suggesting that Piran's father in the Exeter life, Domuel, be identified with Dywel ab Erbin, a 5th century prince of Dumnonia (Devon and Cornwall). Research undertaken by the St Piran Trust  has led them to the conclusion that Saint Piran was indeed Saint Ciarán of Saigher or perhaps a disciple, as indicated by Dr James Brennan of Kilkenny and Dr T. F. G. Dexter, whose thesis is held in the Royal Cornwall Museum.
- The heathen Irish tied him to a mill-stone, rolled it over the edge of a cliff into a stormy sea, which immediately became calm, and the saint floated safely over the water to land upon the sandy beach of Perranzabuloe in Cornwall.
- He was joined at Perranzabuloe by many of his Christian converts and together they founded the Abbey of Lanpiran, with Piran as abbot.
- Saint Piran 'rediscovered' tin-smelting (tin had been smelted in Cornwall since before the Romans' arrival, but the methods had since been lost) when his black hearthstone, which was evidently a slab of tin-bearing ore, had the tin smelt out of it and rise to the top in the form of a white cross (thus the image on the flag).
Death and veneration
It is said that at his death the remains of the Blessed Martin the Abbot which he had brought from Ireland were buried with him at Perranzabuloe. His own remains were subsequently exhumed and redistributed to be venerated in various reliquaries. Exeter Cathedral was reputed to be the possessor of one of his arms, while according to an inventory, St Piran's Old Church, Perranzabuloe, had a reliquary containing his head and also a hearse in which his body was placed for processionals.
St Piran's Day
St Piran's Day is very popular in Cornwall and the term 'Perrantide' has been coined to describe the week prior to this day. Many Cornish-themed events occur in the Duchy and also in areas in which there is a large community descended from Cornish emigrants. The town of Perranporth ('Porthpyran' in Cornish) hosts the annual inter-Celtic festival of 'Lowender Peran', which is also named in honour of him.
The largest St Piran's Day event is the March across the dunes to St Piran's cross which thousands of people attend, generally dressed in black, white and gold, and carrying the Cornish Flag. A play of the Life of St Piran, in Cornish, has been enacted in recent years at the event. Daffodils are also carried and placed at the cross. Daffodils also feature in celebrations in Truro, most likely due to their 'gold' colour. Black, white and gold are colours associated with Cornwall due to St Piran's Flag (black and white), and the Duchy Shield (gold coins on black).