The oldest known peace treaty was the Egyptian-Hittite peace treaty. It is also known as Eternal treaty or Silver treaty. The treaty was signed between Hittite empire and Egypt in 1258 BC after the long war, which continued for over 2 centuries. After the Battle of Kadesh in 1274 BC, the sides sought a peace treaty because of heavy casualties on both sides. And it was ratified 16 years later that battle.
