In the eighteenth year of Jehoshaphat’s reign over Judah, Jehoram son of Ahab became king of Israel, and he reigned in Samaria twelve years.
Jewish Publication Society of America Version (JPS1917) - 2 Kings 3:1 >Now Jehoram the son of Ahab began to reign over Israel in Samaria in the eighteenth year of Jehoshaphat king of Judah, and reigned twelve years.