Commentaries:
Barnes' Notes
    David dwelt in the fort -  or stronghold, (as in II Samuel 5:7) i. e. eventually, when the buildings were completed, which may not have been for two or three years. Millo appears to have been a fortress of some kind, the northern defense of the city of David, and to have been a part of the original Canaanite defenses of Zion, as appears probable also from there having been a fortress called the house of Millo in the Canaanite city of Shechem. (Judges 9:6 note, and II Samuel 9:1-13 :20.) Millo may be the native name. Some identify it with the great platform called the Haram es Sherif.
    David built round about -  Probably meaning built his own house and other houses and streets, all, in short, that caused it to be coiled the city of David. (Compare I Chronicles 11:8.) The buildings were within, on the south of Millo, so as to be protected by it on the north, as they were east, west. and south, by the precipitous ravines.
Other Barnes' Notes entries containing 2 Samuel 5:9:
Joshua 10:1
Judges 1:8
2 Samuel 5:7
2 Samuel 5:17
1 Kings 9:15
1 Kings 9:15
Psalms 2:6
Psalms 43:3
Psalms 125:1
Isaiah 29:1
Matthew 2:1
 
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