2 Chronicles 21:1-5

Then Jehoshaphat lay down with his fathers and was buried with his fathers in the city of David, and his son Jehoram became king in his place.

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.