Caedite eos is the short form of a longer sentence reported by the Cistercian monk Caesarius of Heisterbach: Caedite eos. Novit enim Dominus qui sunt eius (Kill them all. For the Lord knows those who are his). It is associated with the papal legate Arnaud Amaury at the massacre of Béziers in 1209, though historians debate whether the attribution is accurate. Students should note that whether or not the phrase was actually spoken, it encapsulates a real logic of religious violence that pervades history: the dehumanization of
the enemy combined with the claim that divine omniscience will sort the innocent from the guilty, thus removing moral responsibility from the
killers. This logic — that the ideological end justifies the massacre of the innocent — is one of the most important and terrible concepts for politically engaged poetry to grapple with. Related terms include damnatio (condemnation), bellum iustum (just war), and the history of crusading ideology.