The Knights of Columbus is the world's largest Catholic fraternal service organization. Founded in the United States in 1882, it is named in honor of Christopher Columbus and describes itself as being dedicated to the principles of Charity, Unity, Fraternity, and Patriotism. There are more than 1.7 million members in 14,000 councils, with nearly 200 councils on college campuses. Membership is limited to "practical Catholic" men aged 18 or older.