Historically, prohibitions on fighting by monastics and clerics have often been discarded; the notion of military monasticism emerged in the 12th century, in large part because of the advocacy of St. Bernard of Clairvaux. Bernard - and, once the papacy gave sanction to the idea, the entire Catholic Church - believed that existing Christian methods of serving the Church's ends in war were inadequate, and that a group of dedicated warrior monks could achieve spiritual merit by waging war, rather than despite it. In this view, war against heretics justified means of waging war that fell outside the bounds of just war; for example, the Teutonic Order, which received papal sanction, made frequent use of massacres and violence to compel conversion during the Baltic Crusades.