What queen in the bible ruled in Judah?

The queen who ruled in Judah was Athaliah. She was the daughter of King Ahab of Israel and Queen Jezebel, and she became queen after the death of her son, Ahaziah. Athaliah seized power by eliminating the royal heirs but was eventually overthrown and killed by Jehoiada the priest and the people of Judah, who restored the rightful heir, Joash, to the throne. Her reign is noted for its idolatry and the suppression of the worship of Yahweh.