In 1833, Samuel Eells founded Alpha Delta Phi, the first fraternity west of the Allegheny Mountains and the first fraternity at Miami University. Over the next two decades, Miami's Alpha founding chapters followed: Beta Theta Pi in 1839, Miami's first Alpha chapter; Phi Delta Theta in 1848; and Sigma Chi in 1855, completing the Miami Triad. Miami later became home to two more Alpha chapters with the creation of Delta Zeta in 1902 and what would become Phi Kappa Tau in 1906. Following Miami's precedent, approximately 800 chapters of these five Alphas have been formed in the United States and internationally, and Miami University shares with Union College in Schenectady, New York, the title "Mother of Fraternities."