Saint Patrick’s Day is a cultural and religious holiday celebrated internationally on 17 March. It commemorates Saint Patrick (c. AD 387–461), the most commonly recognised of the patron saints of Ireland, and the arrival of Christianity in Ireland. It is observed by the Catholic Church, the Anglican Communion (especially the Church of Ireland), the Eastern Orthodox Church and Lutheran Church. Saint Patrick’s Day was made an official feast day in the early seventeenth century, and has gradually become a secular celebration of Irish culture in general.
– From Wikipedia, the free encyclopedia

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