Editing Belshazzar (section)

=== Regent in Babylon ===
[[File:Nabonidus's preoccupation with the moon god Sin led to building work outside Babylon. This clay cylinder records the restoration of Sin's ziggurat at Ur, and also asks him to protect Nabonidus and his son, Belshazzar. From Ur, Iraq.jpg|thumb|This clay cylinder records the restoration of Sin's ziggurat at Ur by Nabonidus, and also asks him to protect Nabonidus and his son, Belshazzar. From Ur, Iraq]]
[[File:This administrative document is dated to the 24th day of Kislimu in the 11th year of Nabonidus, king of Babylon. It mentions a slave of Bel-sharra-usur (Belshazzar), son of the king. From Borsippa, Iraq.jpg|thumb|This administrative document is dated to the "24th day of Kislimu in the 11th year of Nabonidus, king of Babylon". It mentions a slave of Bel-sharra-usur (Belshazzar), son of the king. Although Belshazzar is acting as a regent, the formal date shows that Nabonidus is still the reigning king. From Borsippa, Iraq]]
[[File:Neo-Babylonian Empire under Nabonidus map.png|thumb|Map of the [[Neo-Babylonian Empire]] under Nabonidus]]
Nabonidus left Babylon in May 553 BC to campaign in the west. He eventually led his forces into Arabia, conquering several cities, including the city of [[Tayma]].{{Sfn|Beaulieu|1989|p=|pp=168–169}} Nabonidus made Tayma his provisional seat and he would stay there for about a decade, not returning to Babylon until September or October of 543 or 542 BC.{{Sfn|Wiseman|1991|p=248}} October 543 BC is the return date most supported by surviving Babylonian documentation.{{Sfn|Beaulieu|1989|p=165}} The purpose for this prolonged stay, effectively self-exile, in Tayma is unclear and debated.{{Sfn|Wiseman|1991|p=247}}{{Sfn|Beaulieu|1989|p=171}} During Nabonidus's absence, Belshazzar was put in charge of the administration in Babylonia.{{sfn|Waters|2014|p=43}}{{Sfn|Beaulieu|1989|p=63}} Though this period has often been dubbed a "co-regency", Belshazzar never assumed an official title.{{Sfn|Beaulieu|1989|p=63}}{{sfn|Chavalas|2000|p=164}} The [[Verse Account of Nabonidus]], a biased{{Sfn|Beaulieu|1989|p=172}} document probably written after Nabonidus was deposed by Cyrus the Great, states that Nabonidus entrusted Belshazzar with the kingship, but there are no records of Belshazzar assuming the royal title.{{Sfn|Beaulieu|1989|p=|pp=63, 154}} Though it is clear that Belshazzar during his father's absence assumed many responsibilities typically only held by the king,{{Sfn|Beaulieu|1989|p=155}} several prerogatives were also kept solely by Nabonidus.{{Sfn|Beaulieu|1989|p=186}} These include:
* Belshazzar never assumed, and was not allowed to use, the title of king (''šarru''), which was reserved for Nabonidus.{{Sfn|Beaulieu|1989|p=186}} Throughout the period of his father's absence, even though he was the effective ruler of Babylonia, contemporary documents continue to refer to Belshazzar as the crown prince (''mār šarri'', literally meaning "son of the king").{{Sfn|Beaulieu|1989|p=160|pp=63, 154}} The only sources that refer to Belshazzar as king, rather than crown prince, are later Greek and Jewish sources that do so erroneously.{{Sfn|Beaulieu|1989|p=186}} Though he is never identified as king, several contemporary Babylonian documents refer to both Nabonidus and Belshazzar as "my lord", a designation usually reserved for the king alone.{{Sfn|Beaulieu|1989|p=192}}
* Belshazzar was not allowed to date documents after his own "regnal years". No documents are dated to the "reign of Belshazzar", and no documents mention both Belshazzar and Nabonidus as if there was a formal co-regency. Instead, documents from the period in which Belshazzar was regent continued to be dated after the years of Nabonidus's reign.{{Sfn|Beaulieu|1989|p=186}}
* Belshazzar was not allowed to officiate and oversee the Babylonian [[Akitu|New Year's festival]], which was the duty of the king. The festival was not celebrated throughout Nabonidus's absence, as Belshazzar was not allowed to take up the king's role in the ceremonies, and only resumed after Nabonidus returned to Babylon.{{Sfn|Beaulieu|1989|p=187}}
* Belshazzar is not mentioned in building inscriptions, which usually mention the king responsible. Even during the period of Nabonidus's absence, he is mentioned in building inscriptions in Babylonia as a builder and excavator as if he was actively ruling at the time, with no known references to Belshazzar. In some cases, such as a ritual performed at the tempel of Bunene in Sippar, inscriptions attribute it to Nabonidus while surviving letters prove that Belshazzar was responsible.{{Sfn|Beaulieu|1989|p=187}}

Though Belshazzar's authority was thus limited, he also was allowed, and assumed, certain royal responsibilities.{{Sfn|Beaulieu|1989|p=188}} These include:

* Contemporary documents record ''rēḫātu'' (literally "remains", leftovers from food offerings presented to statues of deities) being sent to both Belshazzar and Nabonidus during the regency. Otherwise, ''rēḫātu'' is only recorded as having been sent to kings,{{Sfn|Beaulieu|1989|p=158}} receiving the remainders of cultic food having been an exclusive right of kings.{{Sfn|Beaulieu|1989|p=188}}
* In Babylonia, temples usually carried out offerings to the king, such as sacrificing a specified number of sheep. Prior to and after Belshazzar's regency, surviving texts only contain references to offerings to the king (i.e. Nabonidus), but during the period of the regency there are references to both "offerings to the king" and "offerings to the son of the king".{{Sfn|Beaulieu|1989|p=|pp=188–190}}
* In the Neo-Babylonian Empire, oaths were typically sworn by the king, and several gods, by individuals who were going to conduct various services. Though oaths for most of the regency only refer to Nabonidus, some oaths from late in the regency were sworn by "the majesty of Nabonidus, king of Babylon, and Belshazzar, his son", or even by "the majesty of Nabonidus and Belshazzar". As this phenomenon only began late in the regency period, it is not clear whether this was a prerogative that had been granted to Belshazzar, or if he inserted his name into oaths in violation of an agreement with his father.{{Sfn|Beaulieu|1989|p=190}}
* There may have been a division of the Babylonian army. The Verse Account of Nabonidus states that Nabonidus campaigned in Arabia with the "army of Akkad" (possibly referring to troops of Babylonian origin) whereas Belshazzar was entrusted at home with the "army of all the lands" (possibly referring to troops of foreign origin). Babylonian chronicles refer to the crown prince being stationed at home in Babylonia with "his army".{{Sfn|Beaulieu|1989|p=|pp=190–191}}
* Belshazzar could grant royal privileges identical to those granted by kings. One preserved document, which regards the granting of the privilege to cultivate a tract of land belonging to the Eanna temple in Uruk, is virtually identical to similar privileges issued by Nabonidus, though it is specified to have been issued by Belshazzar. As he could lease out temple land, this suggests that Belshazzar, in administrative matters, could act with full royal power. He was clearly the highest legal authority in Babylonia during Nabonidus's absence. Still, orders by Nabonidus superseded orders by Belshazzar. In one case, sacred garments that Belshazzar ordered to be granted to a temple in Uruk were held back because Nabonidus had given a contrary order before departing for Tayma. Nabonidus also sometimes sent orders to Belshazzar, which Belshazzar was forced to respect and implement.{{Sfn|Beaulieu|1989|p=|pp=193–196}}

The events that transpired in Babylonia during Belshazzar's regency are not well known, owing to a lack of surviving sources. It is clear that the New Year's festival was not celebrated, and that there was concern regarding the rising power of the [[Achaemenid Empire]] under [[Cyrus the Great]]. The Babylonian chronicles describe the actions and conquests of Cyrus in detail throughout Belshazzar's regency.{{Sfn|Beaulieu|1989|p=|pp=197–198}} As Nabonidus's stay in Tayma continued, Belshazzar became acutely aware of the threat presented by the Achaemenids, as he is recorded as having expended resources at projects in Sippar and nearby defenses.{{Sfn|Wiseman|1991|p=248}} In 546 BC, Cyrus the Great crossed the Tigris to invade [[Lydia]], ostensibly a Babylonian ally, and though Belshazzar took up a defensive position with his army, perhaps expecting a sudden Persian attack against Babylonia itself, no aid was sent to the Lydians, who were swiftly conquered by Cyrus. It is possible that Belshazzar had campaigned against the Persians on Lydia's behalf a year prior, in 547 BC. The fall of Lydia in 546 BC meant that the Neo-Babylonian Empire was now effectively encircled by a stronger kingdom which had nearly unlimited resources at its disposal. It seems likely that skirmishes along the border were frequent from then until Babylon's fall.{{Sfn|Beaulieu|1989|p=|pp=198–201}}

It is possible that a noteworthy return to orthodox Babylonian religion, following early attempts by Nabonidus to exalt the moon god [[Sin (mythology)|Sîn]] over the traditional Babylonian supreme deity Marduk, can be attributed to Belshazzar. It may even have been Belshazzar who convinced his father to stay away from Babylonia in the first place, fearing a confrontation with the Babylonian oligarchy and clergy over his father's religious beliefs.{{Sfn|Beaulieu|1989|p=63}} It is probable that Nabonidus, a reformer, and Belshazzar, apparently more religiously conservative, did not see eye to eye in religious matters.{{Sfn|Beaulieu|1989|p=64}} Belshazzar appears to have worked to restore Marduk's status in his father's absence.{{sfn|Henze|1999|p=61}} Upon Nabonidus's return to Babylon, Belshazzar was demoted from his administrative responsibilities and officials he had appointed were dismissed. Nabonidus also had certain inscriptions made during the period of the regency edited to add prayers urging Belshazzar and the people of Babylonia to accept and receive Sîn's blessing.{{Sfn|Beaulieu|1989|p=64}}