In the 5th century AD, St Patrick came to Ireland and converted the Country to Christianity in a great Easter event on the Hill of Slane, near the High Kings’ residence on the Hill of Tara. It is believed that while on his quest, St Patrick chased the Devil out of Ireland. The story goes that while chasing the Devil through Tipperary, St Patrick managed to grab hold of him.

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The Devil took a big bite out of a nearby mountain, hoping to escape through the gap. That gap can still be seen at the top of the Devil's Bit Mountain. The Devil was successful in breaking from St Patrick's hold. However, in biting the lump of rock from the mountaintop, he broke his tooth, and he immediately spat out the piece of rock. The rock landed in Cashel and the Castle that is known as the Rock of Cashel was later built on it in the 12th century.

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Cashel is reputed to be the site of the conversion of the King of Munster by St Patrick in the 5th century AD. The Rock of Cashel was the traditional seat of the Kings of Munster for several hundred years prior to the Norman invasion in the 12th century.