https://www.btstories.com/evil-king-who-repented/

Hezekiah was one of the best kings of all the descendants of David. His son Manasseh, however, was one of the most wicked of them all. He became king when he was 12 years old, and he ruled for 55 years.

He acted worse than the kings of Canaan before the Israelites got there. His father had destroyed all the altars to false gods, but Manasseh had them rebuilt. He put several inside the Temple itself. He led the whole nation to practice witchcraft, and even sacrificed his own sons to false gods.