II Chronicles 21:4-7

Now when Jehoram was established over the kingdom of his father, he strengthened himself and killed all his brothers with the sword, and also others of the princes of Israel. Jehoram was thirty-two years old when he became king, and he reigned eight years in Jerusalem. And he walked in the way of the kings of Israel, just as the house of Ahab had done, for he had the daughter of Ahab as a wife; and he did evil in the sight of the LORD. Yet the LORD would not destroy the house of David, because of the covenant that He had made with David, and since He had promised to give a lamp to him and to his sons forever.