On November 27, 1095, a speech by Pope Urban II at the Council of Clermont used allegations of the persecution of Christians in the Holy Land to launch a series of military adventures by the warrior aristocracies of feudal Christian Western Europe against the Muslim civilisations of the Middle East.
The ensuing two centuries of religious wars, or Crusades, were characterised by land-grabbing, plunder and the massacre of Muslims, Jews and non-Catholic Christians.