kassite kings established trade and diplomacy with assyria, egypt, elam and the hittites. the kassite royal house intermarried with their royal families. there were foreign merchants in babylon and other cities. babylonian merchants traded from egypt (a source of nubian gold) to assyria and anatolia. kassite weights and seals, the tools of trade, have been found in thebes in greece, in southern armenia, and even in a shipwreck off the southern coast of today's turkey.