Nabonidus

Nabonidus, whose name means "May Nabu be exalted," was the final king of the Neo-Babylonian Empire. His reign lasted from 556 BC until Babylon fell to Cyrus the Great and the Achaemenian Empire in 539 BC. As the last native ruler of ancient Mesopotamia, his defeat ended a long sequence of Sumero-Akkadian states, kingdoms, and empires. He was also the last independent king of Babylon. Some scholars view him as a vibrant and individualistic leader, an unorthodox religious reformer, and even the first archaeologist.

Nabonidus's origins and claim to the throne are unclear. He never claimed kinship with previous kings, suggesting he was not related to the Chaldean dynasty. He likely had a prominent career before becoming king, possibly marrying a daughter of Nebuchadnezzar II. His mother, Adad-guppi, was of Assyrian ancestry, while his father, Nabu-balatsu-iqbi, about whom little is known, may have been Assyrian or Babylonian. Some historians speculate that one of his parents might have belonged to the Sargonid dynasty, which ruled the Neo-Assyrian Empire until its fall in 609 BC.

Nabonidus became king after the deposition and murder of Labashi-Marduk in 556 BC, a plot likely led by his own son Belshazzar. Throughout his reign, inscriptions and later sources indicate he worked to elevate the moon god Sîn while diminishing the status of Babylon's traditional national deity, Marduk. Some suggest he aimed to replace Marduk entirely with Sîn as the head of the pantheon, but the extent of these religious reforms is debated. From 552 to 543/542 BC, Nabonidus lived in self-imposed exile in Tayma, Arabia. The reason is unknown, but it may have been due to conflicts with the Babylonian clergy and oligarchy. During this time, Belshazzar acted as regent, though Nabonidus remained recognized as king.

Upon returning to Babylonia in 543/542 BC, Nabonidus intensified his religious efforts, rebuilding the Eḫulḫul temple dedicated to Sîn in the northern city of Harran. His reign ended abruptly in 539 BC when Cyrus the Great swiftly conquered his empire. After the battle of Opis, the Persians entered Babylon without resistance. Several sources say Nabonidus was captured but spared, possibly allowed to go to the region of Carmania. He may have still been alive in exile as late as the reign of Darius the Great.