Pacificator
Usage examples:
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For this peace, which will unite by the bonds of friendship two great nations, already connected by esteem, we are indebted to the valour and wisdom of the heroic pacificator to the wise administration of the government, to the bravery of our invincible armies, to the good understanding subsisting between all the constituted authorities, and, above all, to that spirit of moderation which has known how to fix limits to victory itself.
Francis W. Blagdon in "Paris As It Was and As It Is". -
Then go and tell your master that I henceforth decline his mediation, and that nothing would exasperate me more than the idea that Austria, in return for her crimes and her breach of faith, should reap the best fruits and become the pacificator of Europe.
L. Muhlbach in "NAPOLEON AND BLUCHER". -
At first it seemed to Hamersley the act of another enemy; but in a moment he knew it to be the behaviour of a friend- at least a pacificator bent upon seeing fair play.
Captain Mayne Reid in "The Lone Ranche".