Gamma Rho Chapter was founded at Allegheny College in Meadville, Pennsylvania on February 13, 1888.
Initially, the fraternity custom was to name a new chapter after a closed one, so that all 24 letters of the Greek alphabet were always in use. Because of this, early documents refer to the chapter simply as Rho. This practice ended in 1890 when Convention delegates voted to affix Beta to the name of a chapter to indicate it was the second and to affix Gamma on the second round, then Delta, and so on. The chapter at Allegheny was the third chapter to be known as Rho and, after 1890, it became known as Gamma Rho.