2 Kings 11:19-21

19He took with him the commanders of hundreds, the Carites, the guards, and all the people of the land, and they brought the king down from the house of the LORD and entered the royal palace by way of the Gate of the Guards.

Then Joash took his seat on the royal throne, 20and all the people of the land rejoiced. And the city was quiet, because Athaliah had been put to the sword at the royal palace.

21Joash1 was seven years old when he became king.