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I’m coming up with Pi Beta Phi, but unsure how it relates to 18 6 5.
Pi Beta Phi was founded as a secret organization under the name of I.C. Sorosis on April 28, 1867 at Monmouth College in Monmouth, Illinois. Pi Beta Phi is regarded as the first national women's fraternity.[2] It began when twelve female students wished to enjoy the benefits of a secret society similar to those formed by collegiate men. The founders were Clara Brownlee Hutchinson, Libbie Brook Gaddis, Emma Brownlee Kilgore, Margaret Campbell, Rosa Moore, Ada Bruen Grier, Nancy Black Wallace, Jennie Horne Turnbull, Jennie Nicol, Inez Smith Soule, Fannie Thomson, and Fannie Whitenack Libbey.[3] They planned their society at the home of Major Jacob H. Holt, where two of the women rented a room. The name chosen for the society was I.C. Sorosis. The motto chosen was Pi Beta Phi.
The first fraternity convention was held in 1868 at the home of Fannie Thomson in Oquawka, Illinois. It was also in that year that the fraternity's second chapter was established at Iowa Wesleyan College in Mount Pleasant, Iowa. The expansion made Pi Beta Phi the first national (multi-chapter) women's secret society.
Began in Illinois in 1867, then (HRC’s alumnus) in Iowa. Colors are Wine red, symbol of a talon bird holding arrows, unofficial mascot is Angelica the “angel” and more.
https://www.oldest.org/culture/sororities-america/