1 Now Joram son of Achab, began his reign in Israel in the eighteenth year of Josaphat king of Juda, and reigned twelve years,
2 Kings 3:1 Cross References - Thomson
1 Kings 22:51
51 Ochozias son of Achab, began his reign over Israel, in Samaria, in the seventeenth year of Josaphat king of Juda, and reigned over Israel in Samaria two years.
2 Kings 1:17
17 So he died according to the word of the Lord, which Elias spake.
2 Kings 8:16
16 In the fifth year of Joram, son of Achab, king of Israel, while Josaphat reigned over Juda, Joram son of Josaphat began to reign as king of Juda.