The Shamrock is the ubiquitous symbol of all things Irish. Although today it is usually regarded as a simple good luck charm or a St. Patrick’s day decoration, it is one of the oldest Celtic symbols.
The shamrock is a native species of clover in Ireland. A Catholic legend holds that St. Patrick used it’s three lobes as a device for teaching the Holy trinity. To the Druids who came before, it symbolized a similar “three in one” concept- the three dominions of earth, sky, and sea, the ages of man, and the phases of the moon. In Celtic folklore, the Shamrock is a charm against evil, a belief that has carried over in the modern reliance in the four leafed clover as a good luck charm.