The Kadesh Peace Treaty, in Istanbul’s Archeological Museum, is the oldest known peace treaty in the world. It’s dated 1258 BC and signed between Ramesses II of Egypt and Hattusili III of the Hittite Empire. Partial translation of the treaty reads:
“Treaty of Rea-Mashesha-Mai Arnana the great king, the king of the land the of Egypt, the valiant, with Hattusilis, the great king of the Hatti land for establishing good peace and good brotherhood worthy of great kingship forever. These are the words of Rea-Mashesha-Mai Arnana: Now I have established good brotherhood (and) good peace between us forever. In order to establish good peace (and) good brotherhood in the relationship of the land of Egypt with the Hatti land forever.
(I speak) thus: Behold, as for the relationship between the land of Egypt and the Hatti land, since eternity the god does not permit the making of hostility between then because of a treaty (valid) forever.
If an enemy from abroad comes against the land of Egypt and Rea-Mashesha-Mai Arnana, the king of the land of Egypt, your brother sends to Hattusilis, the great king of the Hatti land, his brother saying: “come here to help me against him” to Hattusilis, the king of the Hatti land shall send his foot soldiers (and) his charioteers and, shall slay my enemies.”