2 Chronicles 33:13-14

13and prayed to Him; and He received his entreaty, heard his supplication, and brought him back to Jerusalem into his kingdom. Then Manasseh knew that the Lord was God.

14After this he built a wall outside the City of David on the west side of Gihon, in the valley, as far as the entrance of the Fish Gate; and it enclosed Ophel, and he raised it to a very great height. Then he put military captains in all the fortified cities of Judah.