Now the queen - “Probably the queen-mother, the Nitocris of Herodotus, as the king’s wives were at the entertainment.” - Wintle. Compare Daniel 5:2-3. So Prof. Stuart. The editor of the “Pictorial Bible” also supposes that this was the queen-mother, and thinks that this circumstance will explain her familiarity with the occurrences in the reign of Nebuchadnezzar. He says, “We are informed above, that the ‘wives and concubines’ of the king were present at the banquet. It therefore seems probable that the ‘queen’ who now first appears was the queen-mother; and this probability is strengthened by the intimate acquaintance which she exhibits with the affairs of Nebuchadnezzars reign; at the latter end of which she, as the wife of Evil-Merodach, who was regent during his father’s alienation of mind, took an active part in the internal policy of the kingdom, and in the completion of the great works which Nebuchadnezzar had begun in Babylon. This she continued during the reigns of her husband and son, the present king Belshazzar. This famous queen, Nitocris, therefore, could not but be well acquainted with the character and services of Daniel.” On the place and influence of the queen-mother in the Oriental courts, see Taylor’s Fragments to Calmet’s Dictionary, No. 16. From the extracts which Taylor has collected, it would seem that she held an exalted place at court, and that it is every way probable that she would be called in or would come in, on such an occasion. See also Knolles’ “History of the Turks,” as quoted by Taylor, “Fragments,” No. 50.
By reason of the words of the king and his lords - Their words of amazement and astonishment. These would doubtless be conveyed to her, as there was so much alarm in the palace, and as there was a summons to bring in the wise men of Babylon. if her residence was in some part of the palace itself, nothing would be more natural than that she should be made acquainted with the unusual occurrence; or if her residence was, as Taylor supposes, detached from the palace, it is every way probable that she would be made acquainted with the consternation that prevailed, and that, recollecting the case of Nebuchadnezzar, and the forgotten services of Daniel, she would feel that the information which was sought respecting the mysterious writing could be obtained from him.
And the queen spake and said, O king, live for ever - A common salutation in addressing a king, expressive of a desire of his happiness and prosperity.
Let not thy thoughts trouble thee ... - That is, there is a way by which the mystery may be solved, and you need not, therefore, be alarmed.