2 Chronicles 21:4-8

Now when Jehoram had taken over the kingdom of his father and gathered courage, he killed all his brothers with the sword, and some of the leaders of Israel as well.

Jehoram was thirty-two years old when he became king, and he reigned for eight years in Jerusalem.

He walked in the way of the kings of Israel, just as the house of Ahab had done, for Ahab’s daughter was his wife; and he did evil in the sight of the Lord.

Yet the Lord was not willing to destroy the house of David because of the covenant which He had made with David, and because He had promised to give a lamp to him and his sons forever. Revolt against Judah

In his days Edom broke away from the rule of Judah, and appointed a king over themselves.