Which king of Moab rebelled against Israel after Ahab died?

Answer: Mesha

Mesha king of Moab, a sheep breeder who paid Israel tribute in lambs and wool, rebelled after the death of Ahab.

“Now Mesha king of Moab was a sheep breeder, and he would render to the king of Israel a hundred thousand lambs and the wool of a hundred thousand rams. But after the death of Ahab, the king of Moab rebelled against the king of Israel.”— 2 Kings 3:4-5 (BSB)