The Amarna Letters

Various (the royal courts of Egypt, Babylon, Assyria, Mitanni, Hatti, and Canaanite vassal city-states) · c. 1360-1332 BC (the reigns of Amenhotep III and Akhenaten of Egypt) · Akhetaten (Amarna) (Egypt) · letters

Nearly 400 Akkadian-language tablets recovered from Egypt's royal diplomatic archive at Akhetaten, assembled at, and largely addressed to, the Egyptian chancellery under Amenhotep III and Akhenaten even though the shared written language was Babylonian Akkadian, argue that Late Bronze Age great-power diplomacy ran on a common written language even between rival and vassal states that shared no other tongue.