The Big Three (also referred to as the Holy Trinity) is a historical term used in the United States to refer to Harvard University, Yale University, and Princeton University. The phrase Big Three originated in the 1880s, when these three colleges dominated college football. In 1906, these schools formed a sports compact that formalized a three-way football competition which began in 1878. This early agreement predated the Ivy League by nearly a century. The rivalry remains intense today, though the three schools are no longer national football powerhouses, and schools continue to refer to their intercollegiate competitions as "Big Three" or "Harvard-Princeton-Yale" meets.