2 Chronicles 21:2-6

He had brothers, the sons of Jehoshaphat: Azariah, Jehiel, Zechariah, Azaryahu, Michael, and Shephatiah. All these were the sons of Jehoshaphat king of Israel.

Their father gave them many gifts of silver, gold, and precious things, with fortified cities in Judah; but he gave the kingdom to Jehoram because he was the firstborn.

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.