By a pillar - Rather, “upon the pillar” probably a sort of stand, or pulpit, raised on a pillar. Under the later monarchy the Jewish king seems to have had a special place assigned him in the temple-court, from which on occasions he addressed the people (marginal references).
Related Commentaries of 2 Kings 11:14
2 Kings 11:14
14 And when she looked, behold, the king stood by a pillar, as the manner was, and the princes and the trumpeters by the king, and all the people of the land rejoiced, and blew with trumpets: and Athaliah rent her clothes, and cried, Treason, Treason.