2 Kgs 21:1

21:1 twelve years old. Manasseh most likely began his reign as co-regent with his father, Hezekiah.

fifty-five years. That is, 697–642 b.c., including a ten-year co-regency with Hezekiah. Manasseh’s reign was the longest of any Judean king. Assyrian records say that Manasseh was a vassal of both Esarhaddon (681–669 b.c.) and Ashurbanipal (669–627 b.c.).