No other religious order has increased so rapidly in so brief a period of time as this one did during the 12th century.  
No other religious order has increased so rapidly in so brief a period of time as this one did during the 12th century.  Founded by St. Robert, as a return to strict interpretation of the Benedictine rule, its administration was based on the principles of uniformity, general chapter meeting, and visitation.  In 1112, Bernard joined, and in 1115 he was sent to Clairvaux where he laid the foundation for the order's spectacular growth.  FTP name this order, whose members include the Trappists.
No other religious order has increased so rapidly in so brief a period of time as this one did during the 12th century.  
Cistercians