Alpha Delta Pi was founded as the Adelphean Society on May 15, 1851 at Wesleyan Female College in Macon, Georgia. In 1905, the Society changed its name to Alpha Delta Phi. With the installation of its Beta Chapter at Salem College in Winston-Salem, North Carolina, Alpha Delta Phi became a national organization.
The third chapter was founded at Mary Baldwin Seminary, in Staunton, Virginia, in 1906, the same year that Macon, Georgia was the site of its first national convention. Alpha Delta Phi joined the National Panhellenic Conference in 1909.
The installation of the Sigma Chapter at the University of Illinois in 1912 came shortly after the installation, on the same campus, of the Illinois Chapter of Alpha Delta Phi, a men’s fraternity whose chapters were primarily in the northeast. Alpha Delta Phi, the men’s fraternity, was founded in 1832 at Hamilton College in Clinton, New York. The women made their organization aware of this duplication of name and the problems that surfaced because of it. In 1913, the convention body voted to change the name to Alpha Delta Pi.
Alpha Delta Pi, along with Phi Mu, are the two “Macon Magnolias.” On January 4, 1852, Phi Mu, was founded as the Philomathean Society on the same campus. For a little more than 50 years they remained together on the campus. They made their debuts into the Panhellenic world at about the same time. They are the oldest of the secret societies for women.