And he sat on the throne of the kings.

Athaliah, also spelled Athalia, in the Old Testament, the daughter of Ahab and Jezebel and wife of Jeham, king of Judah. And Athaliah did reign over the land. His mother's name was Athaliah the daughter of Omri king of Israel. Murder of Her Grandchildren:After eight years of royal life, Athaliah became a widow, and her son, Ahaziah, then 22 years of age (2 Kings 8:26; not 42 as in 2 Chronicles 22:2), ascended his father's throne. Our editors will review what you’ve submitted and determine whether to revise the article. Forty and two years old was Ahaziah when he began to reign, and he reigned one year in Jerusalem. "(2) A Benjamite who dwelt in Jerusalem (1 Chronicles 8:26, 28). ... 7. She slew all Ahaziah's children except Joash, the youngest (2 Kings 11:1, 2). From 2 Chronicles 24:7 we gather that a portion of the temple of Yahweh was pulled down, and the material used in the structure of a temple of Baal.5. The daughter of Ahab and Jezebel, and the wife of Jehoram, king of Judah (2 Kings 8:18), who "walked in the ways of the house of Ahab" (2 Chronicles 21:6), called "daughter" of Omri (2 Kings 8:26).
She was the only woman in the Bible to have reigned as a monarch. King James Version (KJV), Two and twenty years old was Ahaziah when he began to reign; and he reigned one year in Jerusalem. Multi-Version Concordance ... And his mother's name was Athaliah the daughter of Omri king of Israel. 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. Her 1st year synchronizes with the 1st of Jehu in Israel, and may be placed 846 B.C. But when Athaliah the mother of Ahaziah saw that her son was dead, she arose and destroyed all the seed royal of the house of Judah. But Jehosheba, the daughter of King Joram, sister of Ahaziah, took Joash the son of Ahaziah and stole him from among the king's sons who were being put to death, and placed him and his nurse in the bedroom.

2Ch 23:21. And let all the people keep the charge of the LORD.
Athaliah was a strong influence on both her husband and their son, Ahaziah, who succeeded his father as king (2 Chron 21:4-6; 22:1-4). And each one of them took his men who were to come in on the sabbath, with those who were to go out on the sabbath, for Jehoiada the priest did not dismiss any of the divisions. And when Athaliah the mother of Ahaziah saw that her son was dead, she arose and destroyed all the seed royal.

The guards stood each with his weapons in his hand, from the right side of the house to the left side of the house, by the altar and by the house, around the king. | GotQuestions.org.

The details are given with unusual fullness in Ki and Chronicles, the writings of which supplement one another. He walked in the ways of the kings of Israel, just as the house of Ahab had done, for [, Then all the assembly made a covenant in the house of God with the king [that is, with the child Joash, to overthrow, He walked in the way of the kings of Israel, just as the house of Ahab had done, for.