Throughout history, olive branches and doves have been used to signify peace and cooperation between different parties. From a historical aspect, when and how did these things come to mean peace?
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It's biblical. It comes from the story of Noah and the flood. After god murdered the entire world with 40 days and 40 nights of rain. Noah's ark was afloat on the water...
Genesis 8: 6-11
After forty days Noah opened a window he had made in the ark and sent out a raven, and it kept flying back and forth until the water had dried up from the earth. Then he sent out a dove to see if the water had receded from the surface of the ground. But the dove could find nowhere to perch because there was water over all the surface of the earth; so it returned to Noah in the ark. He reached out his hand and took the dove and brought it back to himself in the ark. He waited seven more days and again sent out the dove from the ark. When the dove returned to him in the evening, there in its beak was a freshly plucked olive leaf! Then Noah knew that the water had receded from the earth.
I guess the peace part is that god stops murdering.