fort. the "strong hold" of 2 Samuel 5:7. Citadel.
round about. the wall, which was continued by Solomon (1 Kings 9:15; 1 Kings 9:24; 1 Kings 11:27), afterward by Hezekiah (2 Chronicles 32:5), and extended by Manasseh (2 Chronicles 33:14).
Millo. the Millo, or the filling up: i.e. of the valley between Moriah and Jebus.