2 Kings 3:1

So Ahaziah died according to the word of Yahweh which Elijah had spoken. And because he had no son, Jehoram became king in his place in the second year of Jehoram the son of Jehoshaphat, king of Judah.

So the king of Israel went with the king of Judah and the king of Edom; and they went around on a seven days’ journey, and there was no water for the camp or for the cattle that followed them.

Now in the fifth year of Joram the son of Ahab king of Israel, Jehoshaphat being then the king of Judah, Jehoram the son of Jehoshaphat king of Judah became king.

Moab Rebels Against Israel