2 Chronicles 21:2-4

2And he had brethren, the sons of Jehoshaphat: Azariah and Jehiel, and Zechariah, and Azariah, and Michael, and Shephatiah: all these were sons of Jehoshaphat king of Israel.

3And their father had given them great gifts of silver and of gold and of precious things, besides fortified cities in Judah; but the kingdom he gave to Jehoram, for he was the firstborn.

4And Jehoram established himself over the kingdom of his father, and strengthened himself; and he slew all his brethren with the sword, and [certain] also of the princes of Israel.