sentences:  Kassite kings established trade and diplomacy with Assyria.Puzur-Ashur III of Assyria and Burna-Buriash I signed a treaty agreeing the border between the two states in the mid-16th century BC, Egypt, Elam, and the Hittites, and the Kassite royal house intermarried with their royal families.There were foreign merchants in Babylon and other cities, and Babylonian merchants were active from Egypt (a major source of Nubian gold) to Assyria and Anatolia.