Bernard+of+Clairvaux

role in investiture conflict: strong critic of the temporal power of the church

enemy of Peter Abelard founder of Cistercian order (lived to 1153)

criticized Abelard for trying to "grasp everything which was God with human understanding"

prompted scholastics to find a religious justification for their activities

ended up preaching a crusade and prosecuting heresies (abelard)