Ahab and Jezebel promote Baal worship
Ahab married Jezebel, a princess of Sidon, built a temple for Baal in Samaria, and did more to provoke God than any king before him.
Ahab the son of Omri did that which was evil in Yahweh’s sight above all that were before him.
1 Kings 16:30 (World English Bible)
Jezebel brought hundreds of prophets of Baal and Asherah to Israel and hunted down the prophets of Yahweh. Baal was worshiped as the storm god who brought rain, which is why the drought Elijah announced struck at the heart of Baal's claims.
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Dating notes
Ahab began to reign in 918 BC (Ussher) and reigned 22 years.