2 Kings 1:17
So he died according to the word of the LORD which Elijah had spoken. And Jehoram (son of Ahab) reigned in his stead, in the second year of Jehoram, the son of Jehoshaphat, king of Judah, because Ahaziah had no son.
2 Kings 3:1
Now Jehoram, the son of Ahab, began to reign over Israel in Samaria the eighteenth year of Jehoshaphat, king of Judah, and reigned twelve years.
1 Kings 22:51
Ahaziah, the son of Ahab, began to reign over Israel in Samaria in the year seventeen of Jehoshaphat, king of Judah, and reigned two years over Israel.
2 Kings 8:16-17
And in the fifth year of Joram, the son of Ahab, king of Israel, Jehoshaphat being then king of Judah, Jehoram, the son of Jehoshaphat king of Judah, began to reign.