And now, behold, Adonijah reigneth,.... Has set up himself as king, and is by some saluted as such; but lest it should be thought by David that she suggested by this that he was guilty of the breach of his oath, or on any account to be blamed, she adds:
and now my lord, O king, thou knowest it not; which as it acquitted him from all blame, so it made the sin of Adonijah the more heinous, that he should do this without consulting his father about it; and was not only neglect of him as a father, and an act of disrespect and disobedience to him as such, but even of high treason, to assume the throne in his father's lifetime, without his consent.
Keil & Delitzsch on 1 Kings 1:11-33
Adonijah's attempt was frustrated by the vigilance of the prophet Nathan.
Kg1 1:11-13
Nathan informed Solomon's mother, Bathsheba (see at Sa2 11:3), that Adonijah was making himself king (מלך כּי, that he had become as good as king: Thenius), and advised her, in order to save her life and that of her son Solomon (וּמלטי, and save = so that thou mayest save; cf. Ewald, 347, a.), to go to the king and remind him of his promise on oath, that her son Solomon should be king after him, and to inquire why Adonijah had become king. If Adonijah had really got possession of the throne, he would probably have put Solomon and his mother out of the way, according to the barbarous custom of the East, as h…
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Dictionary: Easton's (1897) and Smith's (1863), public domain. Topics: Nave's Topical Bible (1896) and Torrey's Topical Textbook (1897), public domain. Both as parsed by NEUU (CC BY 4.0).