I learned that the first GLO for women was originally I.C. Sorosis, which then became Pi Beta Phi.  I cannot remember the actual year, nor do I remember learning what the first "sorority" was.
(I just went along in life thinking this was what everyone was taught!!!)
Please don't flame me if I'm wrong!!  (It's been awhile and I will be soooo embarassed if I'm way off! 
 
I think I will make this one of my first Gamma Chi Educational Presentations!  Sounds like a good topic to lead off with.