Kadesh treaty
Wikipedia: “The Egyptian–Hittite peace treaty, also known as the Eternal Treaty or the Silver Treaty, is the only ancient Near Eastern treaty for which both sides' versions have survived. It is sometimes called the Treaty of Kadesh after the well-documented Battle of Kadesh fought some sixteen years earlier, although Kadesh is not mentioned in the text. Both sides of the treaty have been the subject of intensive scholarly study. The treaty itself did not bring about a peace; in fact "an atmosphere of enmity between Hatti and Egypt lasted many years," until the eventual treaty of alliance was signed.
Translation of the texts revealed that this engraving was originally translated from silver tablets given to each side, which have since been lost to contemporary historians. “