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The very oldest texts in any language written in Ireland that have survived relate to St Patrick. One, the Confessio, outlines his own account of his life. To the modern reader, it may seem sparse. There is no mention of Pascal fires, of shamrock or of snakes.
The tale of St Patrick developed over time, and to fulfil different purposes. Muirchú’s Latin Life of Saint Patrick, compiled around the year 680 which includes tales of wonders, was written to confirm Armagh’s pre-eminent place in the Irish Church. Patrick was said to have arrived in Ireland in 432AD to undermine the earlier Palladius who was documented to have arrived in 431AD. The development of the myth continued into the 15th century, with examples to be found in the Book of Lismore and the Leabhar Breac. This tradition emphasised St Patrick as a wonder worker and a prophet. At the same time secular writings such as the 12th century Acallamh na Senorach include stories of Patrick meeting the Fianna.
The Norman invasion saw a parallel tradition emerge, starting with Gerald of Wales’ outline of Patrick’s life in Topographia Hibernica, which included a debunking of the legend of the banaishment of the snakes. Jocelin of Furness’ account, based on resources some of which are now lost, was written as part of the Anglo-Norman attempt to appropriate the saint. Written at the same time as the shrine in Downpatrick was established, it portrays Patrick as a miracle-working prophet, whose mother was related to St. Martin of Tours.