1 And Jehoram the son of Achab became king over Israel in Samaria in the eighteenth year of Jehoshaphat the king of Judah, and he reigned twelve years.
2 Kings 3:1 Cross References - Leeser
1 Kings 22:51
51 (22:52) Achazyahu the son of Achab became king over Israel in Samaria in the seventeenth year of Jehoshaphat, the king of Judah; and he reigned over Israel two years.
2 Kings 1:17
17 And he died, according to the word of the Lord which Elijah had spoken; and Jehoram became king in his stead in the second year of Jehoram the son of Jehoshaphat the king of Judah; because he had no son.
2 Kings 8:16
16 And in the fifth year of Joram the son of Achab the king of Israel, Jehoshaphat being yet king of Judah, Jehoram the son of Jehoshaphat the king of Judah became king.