Verse 21. "The city was quiet" - There was no attempt at a counter-revolution. Concerning the coronation of Joash, there is a curious circumstance mentioned by the Targumist on ver. 11, it is as follows:- "And they brought forth the son of the king, and put on him the royal crown which David took from the head of the king of the children of Ammon. In it was inserted the precious attracting stone, in which was engraven and expressed the great and honourable NAME [ hwhy - which David had placed there by the Holy Spirit: and it was of the weight of a talent of gold; it was therefore a testimony to the house of David that no king who was not of the seed of David should be able to put it on his head, nor be able to bear its weight. When, therefore, the people saw it placed on the head of Joash, and that he was able to bear this crown, they believed him to be of the seed of David, and immediately constituted him king.
Therefore Jehoiada and his sons anointed him, and said, May the king be prosperous in his kingdom!" The Jews say that this was the crown of the king of the Ammonites; and that it was always worn afterwards by the kings of the house of Judah. See Jarchi on this place.