Chaldea in the context of "Nabu-shar-usur"

Babylonian astronomy was the study or recording of celestial objects during the early history of Mesopotamia. The numeral system used, sexagesimal, was based on 60, as opposed to ten in the modern decimal system. This system simplified the calculating and recording of unusually great and small numbers.

During the 8th and 7th centuries BC, Babylonian astronomers developed a new empirical approach to astronomy. They began studying and recording their belief system and philosophies dealing with an ideal nature of the universe and began employing an internal logic within their predictive planetary systems. This was an important contribution to astronomy and the philosophy of science, and some modern scholars have thus referred to this approach as a scientific revolution. This approach to astronomy was adopted and further developed in Greek and Hellenistic astrology. Classical Greek and Latin sources frequently use the term Chaldeans for the philosophers, who were considered as priest-scribes specializing in astronomical and other forms of divination. Babylonian astronomy paved the way for modern astrology and is responsible for its spread across the Graeco-Roman empire during the 2nd-century Hellenistic Period. The Babylonians used the sexagesimal system to trace the planets' transits, by dividing the 360 degree sky into 30 degrees, they assigned 12 zodiacal signs to the stars along the ecliptic.

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.

The king of Babylon (Akkadian: šakkanakki Bābili, later also šar Bābili) was the ruler of the ancient Mesopotamian city of Babylon and its kingdom, Babylonia, which existed as an independent realm from the 19th century BC to its fall in the 6th century BC. For the majority of its existence as an independent kingdom, Babylon ruled most of southern Mesopotamia, composed of the ancient regions of Sumer and Akkad. The city experienced two major periods of ascendancy, when Babylonian kings rose to dominate large parts of the Ancient Near East: the First Babylonian Empire (or Old Babylonian Empire, c. 1894/1880–1595 BC) and the Second Babylonian Empire (or Neo-Babylonian Empire, 626–539 BC). Babylon was ruled by Hammurabi, who created the Code of Hammurabi.

Many of Babylon's kings were of foreign origin. Throughout the city's nearly two-thousand year history, it was ruled by kings of native Babylonian (Akkadian), Amorite, Armenian, Kassite, Elamite, Aramean, Assyrian, Chaldean, Persian, Greek and Parthian origin. A king's cultural and ethnic background does not appear to have been important for the Babylonian perception of kingship, the important matter instead being whether the king was capable of executing the duties traditionally ascribed to the Babylonian king: establishing peace and security, upholding justice, honouring civil rights, refraining from unlawful taxation, respecting religious traditions, constructing temples, providing gifts to the gods in the temples and maintaining cultic order. Babylonian revolts of independence during the times the city was ruled by foreign empires probably had little to do with the rulers of these empires not being Babylonians and more to do with the rulers rarely visiting Babylon and failing to partake in the city's rituals and traditions.

Chaldia (Greek: Χαλδία, Khaldia) was a historical region located in the mountainous interior of the eastern Black Sea, northeast Anatolia (modern Turkey) in Western Asia. Its name was derived from a people called the Chaldoi (or Chalybes) that inhabited the region in antiquity. Chaldia was used throughout the Byzantine period and was established as a formal theme, known as the Theme of Chaldia (Greek: θέμα Χαλδίας), by 840. During the Late Middle Ages, it formed the core of the Empire of Trebizond until its fall to the Ottoman Empire in 1461.

Anthony Bryer traces the origin of its name not to Chaldea, as Constantine VII had done, but to the Urartian language, for whose speakers Ḫaldi was the Sun God. Bryer notes at the time of his writing that a number of villages in the Of district were still known as "Halt". Other scholars, however, reject the Urartian connection. Χάλυψ, the tribe's name in Greek, means "tempered iron, steel", a term that passed into Latin as chalybs, "steel". Sayce derived the Greek name Chalybe from Hittite Khaly-wa, "land of Halys". More than an identifiable people or tribe, "Chalybes" was a generic Greek term for "peoples of the Black Sea coast who trade in iron".

Shalmaneser III (Šulmānu-ašarēdu, "the god Shulmanu is pre-eminent") was king of the Neo-Assyrian Empire from 859 BC to 824 BC.

His long reign was a constant series of campaigns against the eastern tribes, the Babylonians, the nations of Mesopotamia, Syria, as well as Kizzuwadna and Urartu. His armies penetrated to Lake Van and the Taurus Mountains; the Neo-Hittites of Carchemish were compelled to pay tribute, and the kingdoms of Hamath and Aram Damascus were subdued. It is in the annals of Shalmaneser III from the 850s BC that the Arabs and Chaldeans first appear in recorded history.

The Sargonid dynasty was the final ruling dynasty of Assyria, ruling as kings of Assyria during the Neo-Assyrian Empire for just over a century from the ascent of Sargon II in 722 BC to the fall of Assyria in 609 BC. Although Assyria would ultimately fall during their rule, the Sargonid dynasty ruled the country during the apex of its power and Sargon II's three immediate successors Sennacherib (r. 705–681 BC), Esarhaddon (r. 681–669 BC) and Ashurbanipal (r. 669–631 BC) are generally regarded as three of the greatest Assyrian monarchs. Though the dynasty encompasses seven Assyrian kings, two vassal kings in Babylonia and numerous princes and princesses, the term Sargonids is sometimes used solely for Sennacherib, Esarhaddon and Ashurbanipal.

Though the Sargonid dynasty only encompasses the reigns of a few kings, their rule saw the borders of the empire grow to encompass the entire Ancient Near East, the East Mediterranean, Asia Minor, the Caucasus and parts of the Arabian Peninsula and North Africa, and they witnessed the subjugation of rivals such as Babylonia, Elam, Persia, Urartu, Lydia, the Medes, Phrygians, Cimmerians, Israel, Judah, Phoenicia, Chaldea, Canaan, the Kushite Empire, the Arabs, and Egypt, as Assyria's rivals were either completely conquered or made vassals.

Sennacherib (Neo-Assyrian Akkadian: 𒀭𒌍𒉽𒈨𒌍𒋢, romanized: Sîn-aḥḥī-erība or Sîn-aḥḥē-erība, meaning "Sîn has replaced the brothers") was the king of the Neo-Assyrian Empire from 705 BC until his assassination in 681 BC. The second king of the Sargonid dynasty, Sennacherib is one of the most famous Assyrian kings for the role he plays in the Hebrew Bible, which describes his campaign in the Levant. Other events of his reign include his destruction of the city of Babylon in 689 BC and his renovation and expansion of the last great Assyrian capital, Nineveh.

Although Sennacherib was one of the most powerful and wide-ranging Assyrian kings, he faced considerable difficulty in controlling Babylonia, which formed the southern portion of his empire. Many of Sennacherib's Babylonian troubles stemmed from the Chaldean tribal chief Marduk-apla-iddina II, who had been Babylon's king until Sennacherib's father defeated him. Shortly after Sennacherib inherited the throne in 705 BC, Marduk-apla-iddina retook Babylon and allied with the Elamites. Though Sennacherib reclaimed the south in 700 BC, Marduk-apla-iddina continued to trouble him, probably instigating Assyrian vassals in the Levant to rebel, leading to the Levantine War of 701 BC, and himself warring against Bel-ibni, Sennacherib's vassal king in Babylonia.