 Nabonidus was certainly not a Chaldean, but an Assyrian from Harran, the last capital of Assyria, and proved to be the final native Mesopotamian king of Babylon.He and his son, the regent Belshazzar, were deposed by the Persians under Cyrus II in 539 BCE.When the Babylonian Empire was absorbed into the Persian Achaemenid Empire, the name "Chaldean" lost its meaning in reference to a particular ethnicity or land, but lingered for a while as a term solely and explicitly used to describe a societal class of astrologers and astronomers in southern Mesopotamia.