from 
Pi Beta Phi's Official Website 
Pi Beta Phi Fraternity was founded at Monmouth College in Monmouth, Illinois, on April 28, 1867, as I.C. Sorosis. Pi Beta Phi was 
 the first national secret college society of women to be modeled after the Greek-letter fraternities of men. 
IC Sorosis was changed to Pi Beta Phi in 1888.
Greek Love
TG