St. Patrick’s Color Was Blue
St. Patrick died more than 1,500 years ago on March 17. It's now the saint's designated feast day. According to the Catholic Encyclopedia, we have theologian Luke Wadding to thank for the celebration's permanence: "Each year Wadding kept the Feast of St. Patrick with great solemnity, and it is due to his influence ... that the festival of Ireland's Apostle was inserted on 17 March in the calendar of the Universal Church." While "great solemnity" has clearly not persisted, the date has held firm.
Saint Patrick's color was blue, not green, say historians. The hue — St. Patrick's blue, a lighter shade — can still be seen on ancient Irish flags and was used on armbands and flags by members of the Irish Citizen Army, whose 1916 Easter Rising attempted to end British rule. But the use of green on St. Patrick's Day began during the 1798 Irish Rebellion, when the clover became a symbol of nationalism and the "wearing of the green" on lapels became regular practice. The green soon spread to uniforms as well. That evolution, combined with the idea of Ireland's lush green fields, eventually made blue a thing of the past.