The term
Neo-Babylonian or
Chaldean refers to
Babylonia under the rule of the 11th ("Chaldean") dynasty, from the revolt of
Nabopolassar in
626 BC until the invasion of
Cyrus the Great in
539 BC, notably including the reign of
Nebuchadrezzar II.
Through the centuries of Assyrian domination, Babylonia enjoyed a prominent status, and revolted at the slightest indication that it did not. However, the Assyrians always managed to restore Babylonian loyalty, whether through granting of increased privileges, or militarily. That finally changed in 627 BCE with the death of the last strong Assyrian ruler, Ashurbanipal, and Babylonia rebelled under Nabopolassar the Chaldean the following year. With help from the Medes, Nineveh was sacked in 612, and the seat of empire was again transferred to Babylonia.
Of the reign of the last Babylonian king, Nabonidus (Nabu-na'id), and the conquest of Babylonia by Cyrus, there is a fair amount of information available. This is chiefly derived from a chronological tablet containing the annals of Nabonidus, supplemented by another inscription of Nabonidus where he recounts his restoration of the temple of the Moon-god at Harran; as well as by a proclamation of Cyrus issued shortly after his formal recognition as king of Babylonia. It was in the sixth year of Nabonidus (549 BCE) that Cyrus, the Achaemenid Persian "king of Anshan" in Elam, revolted against his suzerain Astyages, "king of the Manda" or Medes, at Ecbatana. Astyages' army betrayed him to his enemy, and Cyrus established himself at Ecbatana, thus putting an end to the empire of the Medes. Three years later Cyrus had become king of all Persia, and was engaged in a campaign in the north of Mesopotamia. Meanwhile, Nabonidus had established a camp in the desert, near the southern frontier of his kingdom, leaving his son Belshazzar (Belsharutsur) in command of the army.
In 539 BCE Cyrus invaded Babylonia. A battle was fought at Opis in the month of June, where the Babylonians were defeated; and immediately afterwards Sippara surrendered to the invader. Nabonidus fled to Borsippa, and on the 12th of October, after Cyrus' engineers had diverted the waters of the Euphrates, "the soldiers of Cyrus entered Babylon without fighting." Belshazzar was executed shortly thereafter. Nabonidus surrendered and was deported. Gutian guards were placed at the gates of the great temple of Bel, where the services continued without interruption. Cyrus did not arrive until the 3rd of Marchesvan (October), Gobryas having acted for him in his absence. Gobryas was now made governor of the province of Babylon.
