There also was the Benedictine Congregation of Monte Cassino, which existed from the 14th century until afew years ago. This Congregation, which was part of the Benedictine Federation was disbanded by Bergoglio and his Vatican. Don't know why....they still had 7-8 monasteries and over 100 monks total. They were just absorbed into the Benedictine Order, but can't claim being a distinct "congregation" anymore, One Benedictine Congregation which has turned rad liberal in most of its houses and is probably headed for extinction are the Camaldolese (founded by St. Romulaud in the 10th century). They only have about 90 monks left, including 15+ at Big Sur, California ( trying to live like 1960's monks). The only good Camaldolese branch is that of Monte Corona (founded, 16th century), which is much more traditional, and has 2 fairly substantial monasteries of monks in Poland, and 1 in USA with about 8 monks.