Phi Mu was founded in 1852 at Wesleyan College in Macon, Georgia.  It began as the Philomathean Society, a literary society, and is the second oldest secret society for women.  The Philomathean Society became Phi Mu Fraternity in 1904.  Because the word "sorority" was not commonly used when Phi Mu was chartered, its proper name is Phi Mu Fraternity even though it is a women's organization.