The Masonic Lodge of Research #401 AF&AM was organized in 1966, and has been continuously active and productive since. Although its activities are directed towards the study of Masonic history in Connecticut, the Lodge encourages work in wider and more general topics of Masonic study.
The first Lodge of research, Quatuor Coronati Lodge, No. 2076, was organized in 1884. Thereafter many other Grand jurisdictions in the United States and throughout the world began to charter research Lodges. The oldest in the United States being the American Lodge of Research in New York City. In the State of Connecticut it is the Philosophic Lodge of Research chartered in 1942. In 1950, President Harry S. Truman served as Master of the Missouri Lodge of Research while serving as President of the United States; he had chartered the Lodge in 1941 during his Grand Mastership.