The Triangular Hockey League began as an agreement between Harvard, Princeton and Yale to play one another in best-of-three series during the season.
The Triangular League followed a similar pattern to the Intercollegiate Hockey League, which had existed before World War I but rather than expand to include other teams as they had previously, the Trianular league remained a 3-team conference. The future Ivy League squads were typically considered the cream of college ice hockey during the 1920s and, as a result, the League champion would often claim to be the Eastern hockey champion. The League lasted seven years and ended when Harvard and Princeton discontinued their season series in 1927.