Joram succeeds Ahaziah as king of Israel
Jehoram son of Ahab succeeded his brother Ahaziah as king of Israel.
Key passages
2 Ki 1:17

So he died, according to the word of Yahweh that 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 Ki 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

See also