2 Kings 3:1

Now Joram the son of Ahab had become king over Israel in Samaria in the eighteenth year of Jehoshaphat king of Judah. He reigned twelve years

2 Kings 1:17

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

1 Kings 22:51

Ahaziah son of Ahab became king over Israel in Samaria in the seventeenth year of Jehoshaphat king of Judah, and he reigned over Israel two years.

2 Kings 8:16

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

Treasury of Scripture Knowledge

Summary

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.

Bible References

Jehoram

2 Kings 1:17
So he died, according to the word of Yahweh which Elijah had spoken, and Joram became king in his place in the second year of Joram the son of Jehoshaphat, the king of Judah, because he had no son.
2 Kings 8:16
Now in the fifth year of Joram son of Ahab, king of Israel, and Jehoshaphat king of Judah, Joram son of Jehoshaphat became the king of Judah.