As the cold winter begins to thaw into spring, massive arrays of green hues appear. Everything from the Chicago River to outlandish hats turns bright green on St. Patrick’s Day. In the United States, the holiday is a massively popular celebration of everything Irish. Given the substantial Irish population in America, which is many times larger than Ireland itself, it makes sense that St. Patrick’s Day is such a treasured holiday. The celebration is derived from the Catholic saint who lived around the fifth century, St. Patrick, who was enslaved and taken to Ireland. Upon getting out of slavery, he became a priest. Using this position, he returned to Ireland to successfully convert many to Christianity.