720s BC

720s BC 728 BC: Piye invades Egypt, conquering Memphis, and receives the submission of the rulers of the Nile Delta. He founds the Twenty-fifth dynasty of Egypt. 727 BC: Babylonia makes itself independent of Assyria. 724 BC: The Assyrians start a four-year siege of Tyre. 724 BC: The diaulos footrace introduced at the Olympics. 722 BC: Spring and Autumn period of China's history begins as King Ping of Zhou of the Zhou Dynasty reigns in name only. 722 BC: Israel is conquered by Assyrian king Sargon II. 720 BC: End of the Assyrian siege of Tyre.