Jamieson, Fausset and Brown on 2 Kings 8:18

18. daughter of Ahab--Athaliah, through whose influence Jehoram introduced the worship of Baal and many other evils into the kingdom of Judah (see 2Ch 21:2-20). This apostasy would have led to the total extinction of the royal family in that kingdom, had it not been for the divine promise to David (2Sa 7:16). A national chastisement, however, was inflicted on Judah by the revolt of Edom, which, being hitherto governed by a tributary ruler (2Ki 3:9; 1Ki 22:47), erected the standard of independence (2Ch 21:9).

2Ki 8:24. Ahaziah Succeeds Him.