... His influence then culminated in the famous episode of the Rock of Cashel (province of Munster, County of Tipperary): it allowed him to merge Celtic traditions with the dogmas of Christianity by bringing together the ternary symbolism of the Celts with that of the Holy Trinity.
The shamrock he used for this then became one of the emblems of Ireland.
With this successful evangelisation that led to several centuries of original Celtic Christianity, Patrick will become the patron saint of the green island.

His feast set for March 17 will be primarily religious over the centuries before imposing itself under secular contours, starting with the institution of a St. Patrick's Day parade that took place for the first time in Dublin in 1931.
A festival was then launched at the end of the 20th century, a prelude to an internationalisation of this feest. It has since largely exceeded the borders of Ireland, becoming a unifying symbol within Celtic nations but also in many other countries where the Celtic diaspora is present.

March is the month of Celtic cultures with the celebration of St. Patrick each March, 17. However, this tradition is actually pretty recent as it has developed during the second half of the 20th century.
Before that, we must have a look at ancient times with the story of Maewyn (Maun) Succat who lived in the 4th and 5h centuries AD. Born circa 385 in Great Britain, he died on March, 17. When he was young, he has been kidnapped by some pirates : he was then kept as a slave during six years in Ireland. That's there that he chose to convert to the Christian faith.
Later on he has been ordained bishop in France under the name of Patricius (Patrick) before turning back to Ireland in 432…

CELTIC CULTURE

ST. PATRICK'S DAY
The Day of the Celts