King of Babylon in the context of "Code of Hammurabi"

The Neo-Babylonian Empire or Second Babylonian Empire, historically known as the Chaldean Empire, was the last polity ruled by monarchs native to ancient Mesopotamia. Beginning with the coronation of Nabopolassar as the King of Babylon in 626 BC and being firmly established through the fall of the Assyrian Empire in 612 - 609 BC, the Neo-Babylonian Empire was conquered by the Achaemenid Persian Empire in 539 BC, less than a century after the founding of the Chaldean dynasty.The defeat of the Assyrian Empire and subsequent return of power to Babylon marked the first time that the city, and southern Mesopotamia in general, had risen to dominate the ancient Near East since the collapse of the Old Babylonian Empire (under Hammurabi) nearly a thousand years earlier. The period of Neo-Babylonian rule thus saw unprecedented economic and population growth throughout Babylonia, as well as a renaissance of culture and artwork as Neo-Babylonian kings conducted massive building projects, especially in Babylon itself, bringing back many elements from the previous 2,000 years of Sumero-Akkadian culture.

The Neo-Babylonian Empire retains a notable position in modern cultural memory due to the portrayal of Babylon and its greatest king Nebuchadnezzar II in the Bible. The biblical account of Nebuchadnezzar describes his military campaign against the Kingdom of Judah, and in particular the Babylonian siege of Jerusalem in 587 BC which resulted in the destruction of Solomon's Temple and the subsequent Babylonian captivity. The Bible also describes the majesty of Nebuchadnezzar's rule and his sympathetic relationship with his Jewish captives. Babylonian sources describe Nebuchadnezzar's reign as a golden age that transformed Babylonia into the greatest empire of its time.

Nabopolassar (Neo-Babylonian Akkadian: 𒀭𒉺𒀀𒉽, romanized: Nabû-apla-uṣur, meaning "Nabu, protect the son") was the founder and first king of the Neo-Babylonian Empire, ruling from his coronation as king of Babylon in 626 BC to his death in 605 BC. Though initially only aimed at restoring and securing the independence of Babylonia, Nabopolassar's uprising against the Neo-Assyrian Empire, which had ruled Babylonia for more than a century, eventually led to the complete destruction of the Assyrian Empire and the rise of the Neo-Babylonian Empire in its place.

Of unclear, possibly Chaldean, origin and potentially connected to a powerful political family in the southern city of Uruk, Nabopolassar revolted against the Neo-Assyrian king Sinsharishkun at an opportune moment when Babylonia was already plagued by political instability. Though the advantage shifted back and forth dramatically several times, Nabopolassar managed to decisively push the Assyrians out of Babylonia after nearly ten years of fighting. Subsequent campaigns were intended to hinder the possibility of an Assyrian campaign directed at Babylonia through securing the border, but the intervention of the eastern Median Empire under Cyaxares in Nabopolassar's favor shifted the goals and the possibilities of the war.

Nabuna'eed (Neo-Babylonian Akkadian: 𒀭𒀝𒈾𒀪𒀉, romanized: Nabû-naʾid, Hellenized as Nabonidus meaning "May Nabu be exalted" or "Nabu is praised") was the last king of the Neo-Babylonian Empire, ruling from 556 BC to the fall of Babylon to the Achaemenian Empire under Cyrus the Great in 539 BC. Nabonidus was the last native ruler of ancient Mesopotamia, the end of his reign marking the end of thousands of years of Sumero-Akkadian states, kingdoms and empires. He was also the last independent king of Babylon. Regarded as one of the most vibrant and individualistic rulers of his time, Nabonidus is characterised by some scholars as an unorthodox religious reformer and as the first archaeologist.

The origins of Nabonidus, his connection to previous royalty, and subsequently what claim he had to the throne remain unclear, given that Nabonidus made no genealogical claims of kinship to previous kings. This suggests that he was neither related nor connected to the Chaldean dynasty of Babylonian rulers. However, he is known to have had a prominent career of some kind before he became king. It is possible that he was connected to the Chaldean kings via marriage, possibly having married a daughter of Nebuchadnezzar II (r. 605–562 BC). Nabonidus's mother, Adad-guppi, was of Assyrian ancestry. His father, Nabu-balatsu-iqbi, of whom little is known, may also have been either Assyrian or Babylonian. Some historians have speculated that either Adad-guppi or Nabu-balatsu-iqbi were members of the Sargonid dynasty, rulers of the Neo-Assyrian Empire until its fall in 609 BC.

Šamaš-šuma-ukin (Neo-Assyrian Akkadian: 𒌋𒌋𒈬𒁺, romanized: Šamaš-šuma-ukin or Šamaš-šumu-ukīn, meaning "Shamash has established the name"), was king of Babylon as a vassal of the Neo-Assyrian Empire from 668 BC to his death in 648. Born into the Assyrian royal family, Šamaš-šuma-ukin was the son of the Neo-Assyrian king Esarhaddon and the elder brother of Esarhaddon's successor Ashurbanipal.

Despite being the elder son, Šamaš-šuma-ukin was for unknown reasons bypassed as heir to Assyria. His designation as heir to Babylonia was likely devised by Esarhaddon as a means to counteract future rivalry and jealousy between the brothers. Although Esarhaddon specified that Šamaš-šuma-ukin was to swear an oath of allegiance to Ashurbanipal, the clear primary heir, Šamaš-šuma-ukin was also referred to as Ashurbanipal's "equal brother" and Ashurbanipal was to stay out of his affairs. This part of the succession plans were not upheld by Ashurbanipal after Esarhaddon's death; Šamaš-šuma-ukin only acceded to the Babylonian throne months after Ashurbanipal had become king and was throughout his reign a closely monitored vassal, not entrusted with all of Babylonia or substantial military forces and only allowed to make decisions if they were approved and verified by Ashurbanipal.

Iraq, a country located in West Asia, largely coincides with the ancient region of Mesopotamia, often referred to as the cradle of civilization. The history of Mesopotamia extends back to the Lower Paleolithic period, with significant developments continuing through the establishment of the Caliphate in the late 7th century AD, after which the region became known as Iraq. Within its borders lies the ancient land of Sumer, which emerged between 6000 and 5000 BC during the Neolithic Ubaid period. Sumer is recognized as the world's earliest civilization, marking the beginning of urban development, written language, and monumental architecture. Iraq's territory also includes the heartlands of the Akkadian, Neo-Sumerian, Babylonian, Neo-Assyrian, and Neo-Babylonian empires, which dominated Mesopotamia and much of the Ancient Near East during the Bronze and Iron Ages.

Iraq was a center of innovation in antiquity, producing early written languages, literary works, and significant advancements in astronomy, mathematics, law, and philosophy. This era of indigenous rule ended in 539 BC when the Neo-Babylonian Empire was conquered by the Achaemenid Empire under Cyrus the Great, who declared himself the "King of Babylon." The city of Babylon, the ancient seat of Babylonian power, became one of the key capitals of the Achaemenid Empire.

Aššur-nādin-šumi (Neo-Assyrian Akkadian: 𒁹𒀸𒋩𒈬𒈬, romanized: Aššur-nādin-šumi, meaning "Ashur gives a name") was a son of the Neo-Assyrian king Sennacherib and was appointed by him as the king of Babylon, ruling southern Mesopotamia from 700 BC to his capture and execution by the Elamites in 694 BC. Aššur-nādin-šumi was probably Sennacherib's firstborn son and his first crown prince and thus the designated successor to the Assyrian throne.