The day commemorates Saint Patrick and the arrival of Christianity in Ireland, and celebrates the heritage and culture of the Irish in general. Celebrations generally involve public parades and festivals, céilithe, and the wearing of green attire or shamrocks. In contrast to the merry-making in the United States, March 17 has been more holy day than holiday in Ireland. Since 1631, St. Patrick’s Day has been a religious feast day to commemorate the anniversary of the 5th-century death of the missionary credited with spreading Christianity to Ireland. For several centuries, March 17 was a day of solemnity in Ireland with Catholics attending church in the morning and partaking of modest feasts in the afternoon. There were no parades and certainly no emerald-tinted food products, particularly since blue, not green, was the traditional color associated with Ireland’s patron saint prior to the 1798 Irish Rebellion.