Adam Clarke on Daniel 5:10

The queen - came - This is generally allowed to have been the widow of Nebuchadnezzar; if so, she was the queen Amiyt, daughter of Astyages, sister of Darius the Mede, and aunt of Cyrus, according to Polyhistor, cited by Cedrenus. See Calmet. Others think that Nitocris was the person who is said to be queen when Cyrus took the city; and is stated to have been a lady of eminent wisdom and discretion, and to have had the chief direction of the public affairs. She was the mother of Labynithus; and, if this be the same as Belshazzar, she must be the person here introduced.