The king cried aloud to bring in the astrologers, the Chaldeans, and the soothsayers. And the king spoke, and said to the wise men of Babylon, Whosoever shall read this writing, and show me its interpretation, shall be clothed with scarlet, and have a chain of gold about his neck, and shall be the third ruler in the kingdom.
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Aquinas Study Bible
AD 2017
queen: Josephus says she was Belshazzar's grandmother, whereas Origen says she was his mother. She therefore knew about previous events of which the king was ignorant. (St. Jerome)
That means either that he is to be third in rank after the king, or else one of the three princes of the realm----for we elsewhere read of the tristatai. [A tristates is one who stands next in rank to the king and queen, i.e., a vizier.]
It is, of course, ridiculous of me to argue about matters of gender in a commentary on the prophets; but inasmuch as an ignorant but ostentatious critic has rebuked me for changing "necklace" (torquis) from feminine to masculine, I will make the brief observation that while Cicero (B) and Vergil use "necklace" in the feminine, Livy uses it in the masculine.
Forgetting about the experiences of Nebuchadnezzar, he was following after the ancient and ingrained error of his family, so that instead of summoning a prophet of God he summons the magicians and Chaldeans and soothsayers.