What did St. Patrick get established in Ireland?
St. Patrick spread the Catholic religion in Ireland.
St Patrick´s day is named after Ireland´s patron saint. St Patrick is said to have converted many druids and pagans in Ireland to Catholicism. St. Patrick day was called st. Patrick because it is a memory of the saint named St. Patrick. Clarification: The Catholic feast day of Saint Patrick is March 17. That is why it is called St. Patrick's Day.