2 Kings 3:1

Now Jehoram the son of Ahab became king over Israel at Samaria in the eighteenth year of Jehoshaphat king of Judah, and reigned twelve years.

Surrounding context

3:1 Now Jehoram the son of Ahab became king over Israel at Samaria in the eighteenth year of Jehoshaphat king of Judah, and reigned twelve years.

3:2 And he did evil in the sight of the LORD, but not like his father and mother; for he put away the sacred pillar of Baal that his father had made.