The movement faced opposition from clergy and laity at times, both during its early years under Groote’s leadership and under Radewyns’ later expansion. Much of this suspicion was similar to that directed at other new forms of religious devotion developed in the period, such as beguine and beghard movements. Also, the strong resemblance to the monastic life of the daily routine among the Brethren provoked accusations from the mendicant orders that the Brethren and Sisters of the Common Life were starting a new mendicant order, in violation of the Fourth Lateran Council's prohibition of new orders in 1215, and without taking vows. The simplicity and devotion of the "Devotio Moderna", though, seems to have lessened the force of many of these criticisms.