St. Patrick was the most commonly recognized of patron saints in Ireland. He was known to banish snakes from Ireland and also teaching the Irish about the concept of the Trinity by showing the shamrock. The day began as a Catholic holiday and now is a non-secular day for many people around the world. To celebrate their Irish heritage, dye rivers green or to drink green beer. The wearing of green and shamrocks have become a feature of the day, for good luck, kisses, etc. So, I made this shirt because my boss said to wear green to work today. I do like shamrocks, as they are green clover plants, but I am not Irish.