In classical rabbinic literature
Belshazzar appears in many works of classical Jewish rabbinic literature.
The chronology of the three Babylonian kings is given in the Talmud as follows: Nebuchadnezzar reigned forty-five years, Evil-merodach twenty-three, and Belshazzar was monarch of Babylonia for two years, being killed at the beginning of the third year on the fatal night of the fall of Babylon (Meg. 11b).
The references in the Talmud and the Midrash to Belshazzar emphasize his tyrannous oppression of his Jewish subjects. Several passages in the Prophets are interpreted as though referring to him and his predecessors. In the passage, "As if a man did flee from a lion, and a bear met him" (Amos v. 19), the lion represents Nebuchadnezzar, and the bear, equally ferocious if not equally courageous, is Belshazzar.
The three Babylonian kings are often mentioned together as forming a succession of impious and tyrannous monarchs who oppressed Israel and were therefore foredoomed to disgrace and destruction. The verse in Isa. xiv. 22, "And I will rise up against them, saith the Lord of hosts, and cut off from Babylon name and remnant and son and grandchild, saith the Lord," is applied to the trio. "Name" refers to Nebuchadnezzar, "remnant" to Evil-merodach, "son" is Belshazzar, and "grandchild" Vashti (ib.). The command given to Abraham to cut in pieces three heifers as a part of the covenant established between him and his God, is thus elucidated, "And he said unto him, take unto me three heifers" (Gen. xv. 9). This symbolizes Babylonia, which gave rise to three kings, Nebuchadnezzar, Evil-merodach, and Belshazzar, whose doom is prefigured by this act of "cutting to pieces" (Midrash Genesis Rabbah xliv.).
The Midrash literature enters into the details of Belshazzar's death. It is stated that Cyrus and Darius were employed as doorkeepers of the royal palace. Belshazzar, being greatly alarmed at the mysterious handwriting on the wall, and apprehending that some one in disguise might enter the palace with murderous intent, ordered his doorkeepers to behead every one who attempted to force an entrance that night, even though such person should claim to bethe king himself. Belshazzar, overcome by sickness, left the palace unobserved during the night through a rear exit. On his return the doorkeepers refused to admit him. In vain did he plead that he was the king. They said, "Has not the king ordered us to put to death any one who attempts to enter the palace, though he claim to be the king himself?" Suiting the action to the word, Cyrus and Darius grasped a heavy ornament forming part of a candelabrum, and with it shattered the skull of their royal master (Cant. R. iii. 4).