Five rebels proclaimed themselves King of Babylon

The early Achaemenid rulers had great respect for Babylonia, regarding the region as a separate entity or kingdom united with their own kingdom in something akin to a personal union. The region was a major economic asset and provided as much as a third of the entire Achaemenid Empire's tribute. Despite Achaemenid attention and the recognition of the Achaemenid rulers as Kings of Babylon, Babylonia resented the Achaemenids, like the Assyrians had been resented a century prior. At least five rebels proclaimed themselves King of Babylon and revolted during the time of Achaemenid rule in attempts at restoring native rule; Nebuchadnezzar III (522 BC), Nebuchadnezzar IV (521–520 BC), Bel-shimanni (484 BC), Shamash-eriba (482–481 BC) and Nidin-Bel (336 BC).