He moved the dates of early Christian celebrations to dates that were sacred to the Pagans and merged Christian symbols with Pagan ones so that the new religion could be more easily assimilated. An 18 th century historical account records that Saint Patrick used the shamrock, a three-leaf clover, to explain the Holy Trinity. In Pagan Ireland, three was a significant number and the Irish had many triple deities. The triple spiral symbol, or Triskelion, appears at many ancient megalithic and Neolithic sites in Ireland.
As stated in the Annals of the Kingdom of Ireland:
“Nothing is clearer than that Patrick engrafted Christianity on the Pagan superstitions with so much skill, that he won the people over to the Christian religion before they understood the exact difference between the two systems of belief.”
Banishes the Snakes from Ireland
One of the most famous legends Saint Patrick is associated with his supposed banishing of all snakes from Ireland. According to the story, Patrick drove snakes into the sea after they attacked him during a 40-day fast that he was undertaking on top of a hill.
However, post-glacial Ireland never had snakes. Water has surrounded Ireland since the end of the last glacial period, preventing snakes from slithering over; before that, it was blanketed in ice and too chilly for the cold-blooded creatures.
The legend of Saint Patrick and the snakes is rather an allegory for his eradication of Pagan ideology. When Patrick drives the snakes out of Ireland, it is symbolically saying that he cast out the old religion and brought in a new one.
Saint Patrick’s death is recorded in the Annals of the Kingdom of Ireland in the year 493 AD
sursa: https://www.ancient-origins.net/history-ancient-traditions/st-patrick-ireland-001455G
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