The seventh Beatitude in Matthew 5:9 - 'Blessed are the peacemakers: for they shall be called the children of God' - contributed one of the most consequential words in English political and moral vocabulary. 'Peacemaker' as a compound noun appears to owe its English currency directly to this verse: someone who actively makes peace rather than merely experiencing it or hoping for it.
The Greek is hoi eirenopoioi: 'the peace-makers,' from eirene (peace, the Greek equivalent of the Hebrew shalom) and poiein (to make, create, do). The word eirenepoios does not appear in Greek literature before this verse with this meaning; it appears to be a deliberate coinage or at minimum a very rare word that Jesus's use made permanent. The beatitude thus inaugurated both a word and a vocation.
In the context of the Sermon on the Mount, the peacemaker stands in a series of unlikely candidates for divine blessing: the poor in spirit, the mourners, the meek, the hungry, the merciful, the pure in heart, the peacemakers, and those persecuted for righteousness. The list is consistently counterintuitive, and the peacemaker fits: in the ancient Mediterranean world, honor accrued to those who won victories in conflict, not to those who prevented or resolved it. Peacemaking was, from the perspective of Roman military culture, an admission of weakness or an act of subordination. Jesus blessed it as the most God-like of human activities - 'they shall be called the children of God' - because God in Jewish understanding was the ultimate peacemaker, the one who restores shalom.
In English the word 'peacemaker' was adopted by diplomats, mediators, and conflict resolution practitioners as their defining self-description. It entered international law and diplomatic vocabulary as a term for third-party intervention to resolve conflicts. The United Nations uses peacemaking as a technical term for diplomatic action to prevent or end armed conflict (distinct from peacekeeping, which refers to military monitoring of a ceasefire).
The irony of the word's most famous secular use is considerable. In 1873, Colt introduced its Model 1873 Single Action Army revolver, which became known by the nickname 'The Peacemaker' and 'The Equalizer.' The marketing logic - that a widely available firearm would deter aggression and produce peace by balancing power - inverted the beatitude's meaning precisely. Rather than making peace through reconciliation, the Colt Peacemaker made a specific sort of Western frontier equilibrium through the threat of violence. The ironic use of the beatitude term to name a lethal weapon is itself a commentary on how American culture processed the Sermon on the Mount.
In modern usage 'peacemaker' appears in contexts ranging from international diplomacy to family therapy to corporate conflict resolution. Conflict resolution has developed as a professional field partly under the influence of this word: the idea that skilled intervention can transform conflicts without violence or domination is embedded in the term's Matthean origin. The promise attached to the beatitude - that peacemakers will be recognized as children of God - has been largely secularized: peacemakers will be recognized as the best of humanity, the people who do what the rest of us cannot or will not.