Albert Barnes Commentary 1 Kings 2:19

"Bath-sheba therefore went unto king Solomon, to speak unto him for Adonijah. And the king rose up to meet her, and bowed himself unto her, and sat down on his throne, and caused a throne to be set for the king`s mother; and she sat on his right hand." — 1 Kings 2:19 (ASV)

A seat — Or, “a throne.” We have here a proof of the high dignity of the Queen-mother. Compare also 1 Kings 15:13; 2 Kings 11:1–3. In the Persian court, the Queen-mother often had the chief power.