King Manasseh reigned in Judah for 55 years and he was the worst king. He was bad - like King Ahab in the northern kingdom of Israel (which at present would have been destroyed by Assyria). He reigned approximately from 697 - 642 B.C. His son King Amon came to the throne but only ruled for two years; he too was wicked. His son King Josiah came to the throne, but he was actually the best and he reigned for 31 years.