Second Kings 11 and 12 are a record of the reigns of Athaliah and Joash over Judah.
Athaliah, the mother of Ahaziah and the wife of Joram from the house of Ahab (8:25-27), destroyed all the royal seed (11:1).
Jehosheba, the daughter of King Joram and sister of Ahaziah, hid Joash the son of Ahaziah in the house of Jehovah for six years while Athaliah, the grandmother, reigned over the land (vv. 2-3).
In the seventh year Jehoiada the high priest devised wisely to anoint Joash, and the people recognized him as the king with joy, clapping their hands and saying, "Long live the king!" (vv. 4-12).
Athaliah reacted to the enthronement of Joash by tearing her clothes and crying out, "Treason! Treason!" (vv. 13-14). Then according to the instruction of Jehoiada the high priest she was killed outside the house of God (vv. 15-16).