There are many firsts!
Alpha Delta Pi (started out as Adelphian Society): 1851

Phi Mu (started out as Philomathean Society, second oldest sorority): 1852

Kappa Alpha Theta (the first to be FOUNDED with a Greek name): 1870

Gamma Phi Beta (the first Greek letter women's organization to call themselves a SORORITY): 1872

Pi Beta Phi (started out as I.C. Sorosis, it was the first sorority to be founded with the intent of setting up a chain of chapters at other schools): 1867