2 Chronicles 33:21-23

Amon rules Judah as king

21 Amon was 22 years old when he became king. He ruled as king in Jerusalem for two years. 22 Amon did things that the Lord said were evil, as his father Manasseh had done. He offered sacrifices to all the idols that his father Manasseh had made. He worshipped those idols. 23 But he did not make himself humble and turn back to the Lord, as his father Manasseh had done. Instead, Amon became guilty of even more sins.

33:21Amon was king for only two years from about 642 to 640 BC.